The Iowa caucuses are quadrennial
electoral events for the
Democratic and
Republican parties in the
U.S. state of
Iowa
Iowa ( ) is a U.S. state, state in the upper Midwestern United States, Midwestern region of the United States. It borders the Mississippi River to the east and the Missouri River and Big Sioux River to the west; Wisconsin to the northeast, Ill ...
. Unlike
primary elections, where
registered voters cast ballots at
polling places on election day, Iowa
caucuses are meetings where voters gather to discuss and select candidates for their registered party. Political parties hold the caucuses, in contrast to most state-run primaries. Both
presidential and
midterm elections in Iowa use caucuses. The caucuses are also held to select delegates to county conventions and party committees, among other party activities.
The Iowa caucuses are noteworthy as the first major contest of the
United States presidential primary
Each of the 50 U.S. states, the District of Columbia, and five territories of the United States holds either primary elections or caucuses to help nominate individual candidates for president of the United States. This process is designed ...
season. Although caucus-goers have been unrepresentative of the nation's overall demographic, caucuses are still seen by some as a strong indicator of how a presidential candidate will do in later contests. Candidates who do poorly in the Iowa caucus frequently drop out in the following days.
The
2020 Iowa Republican caucuses and the
2020 Iowa Democratic caucuses
took place on February 3, 2020. The Democratic caucus proved controversial after difficulties and errors in the reporting of the final vote totals. Iowa Democratic Party Chair
Troy Price resigned on February 12, 2020, over the chaos resulting from the caucus.
On February 4, 2023, the
Democratic National Committee
The Democratic National Committee (DNC) is the principal executive leadership board of the United States's Democratic Party (United States), Democratic Party. According to the party charter, it has "general responsibility for the affairs of the ...
approved a new calendar for the
2024 Democratic Party presidential primaries, moving the
South Carolina Democratic primary to be held first on February 3, and pushing the
Iowa Democratic caucuses later to March. The
Republican National Committee still announced plans to hold the
Iowa Republican caucuses first in the
2024 Republican Party presidential primaries. By October 6, the Democratic National Committee reached a compromise in which the in-person Iowa Democratic caucuses focusing on party business could still be held in January, but voting on presidential candidates would be done via
mail-in ballots until
Super Tuesday, March 5.
Background
Political parties in Iowa have used caucuses to select party leaders and candidates for office since the 1800s.
Before 1907, parties selected all candidates for political office through the caucus system.
Iowa held a presidential primary in 1916, but returned to the caucus system in 1917 due to high costs and low participation.
After the
1968 Democratic National Convention protest activity, Democratic Party leaders decided to make changes to their presidential nomination process by spreading out the schedule in each state. Because Iowa had a complex process of precinct caucuses, county conventions, district conventions, and a state convention, they chose to start early. In 1972, Iowa was the first state to hold its Democratic caucus, and it had the first Republican caucus four years later.
Under Iowa law, political parties are required to hold caucuses every two years to select delegates to county conventions and party committees.
For Republicans, the Iowa caucus used to follow the
Iowa Straw Poll in August of the preceding year. The Iowa Straw Poll was held six times, beginning in 1979, but only three Straw Poll winners went on to win the caucus the following year. The Straw Poll was discontinued in June 2015.
With an emphasis on
retail politics, candidates have often pursued the "full
Grassley" or Iowa 99, as they visit all of the counties of the state.
Process

The Iowa caucuses operate differently from the
primary election used by most other states (see
U.S. presidential primary). The caucuses are generally defined as "gatherings of neighbors". Rather than going to
polls and casting ballots, Iowans gather at a set location in each of Iowa's precincts. Typically, these meetings occur in schools, churches, public libraries, or even individuals' houses. Caucuses are held every two years, during both the presidential and
midterm election seasons, but those that receive national attention are the presidential preference caucuses, held every four years. The rules of the caucus process to determine delegates to national conventions are determined by the party and differ substantially between the Democratic and Republican parties.
In addition to the voting and the presidential preference choices, caucus-goers begin the process of writing their parties' platforms by introducing resolutions.
Criticisms
Public focus has been increasingly drawn to the Iowa caucus procedure. Public confidence in the integrity of the caucus system was heavily undermined after the
2020 Iowa Democratic caucus in which numerous irregularities were revealed, including disputed caucus totals following the use of a new smartphone app developed for the caucus, and a failure to publish official results for nearly a week.
Many political figures have also echoed concerns.
Sen. Dick Durbin (D-IL): "I think the Democratic caucus in Iowa is a quirky, quaint tradition which should come to an end. As we try to make voting easier for people across America, the Iowa caucus is the most painful situation we currently face for voting." Former presidential candidate
Julián Castro, who has long been critical of the Iowa caucuses, blasted the process: "It's a mess. What we saw out there and heard about are, consistently, errors in the way that this process was done, whether in the initial phase or the realignment. Inconsistencies in how it was done across precinct sites, caucus sites. It is a total mess."
Democratic Party
Each precinct divides its delegate seats among the candidates in proportion to caucus goers' votes. Participants indicate their support for a particular candidate by standing in a designated area of the caucus site (forming a preference group). An area may also be designated for an "uncommitted" group. Participants may try to convince their neighbors to support their candidates.
Each preference group might informally deputize a few members to recruit supporters from the other groups and, in particular, from among those undecided. Undecided participants might visit each preference group to ask its members about their candidate.
After some time, the electioneering is temporarily halted, and the supporters for each candidate (and for "uncommitted") are counted. At this point, the caucus officials determine which candidates or groups are viable, potentially including the "uncommitted" group.
Depending on the number of county delegates to be elected, the viability threshold is no less than 15% of attendees. ''(For four or more delegates, the threshold is 15%. For three delegates, the threshold is the total number of voters, divided by 6, roughly 16.66%. For two delegates, the threshold is 25%. For one delegate, there is no threshold, and the delegate is elected by a majority vote of eligible voters in attendance, following the first round of alignment.)'' For a candidate (or the "uncommitted" group) to earn any delegates from a particular precinct, the candidate or group must have the support of at least the percentage of participants required by the viability threshold. Once viability is determined, participants have an opportunity to realign: although supporters of viable candidates or groups are locked into their choice, the supporters of nonviable candidates or groups may find a viable candidate or group to support, join with supporters of another nonviable candidate or group to secure a delegate for one of the two, or abstain. This realignment is a distinction of caucuses in that (unlike in most primaries) a voter's second choice can help a candidate.
When the voting is closed, a final headcount is conducted, and each precinct apportions delegates to the county convention. These numbers are reported to the state party, which counts the total number of delegates for each candidate (and delegates who are "uncommitted") and reports the results to the media. Most of the participants go home, leaving a few to finish the business of the caucus: each preference group elects its delegates, and then the groups reconvene to elect local party officers and discuss the platform. The delegates are chosen by the precinct then go to a later caucus, the county convention, to choose delegates to the district convention and state convention. Most of the delegates to the Democratic National Convention are selected at the district convention, with the remaining ones selected at the state convention. Delegates to each level of convention are initially bound to support their chosen candidate but can later switch in a process very similar to what occurs at the precinct level; however, as major shifts in delegate support are rare, the media declares the candidate with the most delegates on the precinct caucus night the winner and relatively little attention is paid to the later caucuses.
In 2014, the Iowa Democratic Party introduced changes to the caucus system to allow members of the military to participate in a statewide caucus and establish satellite caucuses for voters with disabilities and others who have trouble making it to the physical location of the caucuses. They will also work for the passage of a new law that requires employers to allow employees to take time off for the caucuses.
In 2016, the Iowa Democratic Party held the first-ever tele-caucus for members of the military serving outside Iowa and their families; Iowans in the Peace Corps and Diplomatic Corps; and students and Iowans living abroad. In addition, it held satellite caucuses in 2020, in an attempt to improve accessibility and participation in the Iowa caucuses. Starting in 2020, 10% of state convention delegates will be assigned through tele-caucuses.
Beginning with the 2020 caucus, the Iowa Democratic Party publishes not only "State Delegate Equivalents", based on a calculation of likely delegate results after the state caucus is held, but also a statewide raw vote count after the first alignment round (including results for all non-viable candidates) and a statewide raw vote count for all viable candidates after the second alignment round.
Republican Party
The process of selecting Iowa delegates to the Republican National Convention prior to the 2016 election cycle started with the selection of delegates to the county conventions, which in turn affected the delegates elected to district conventions who also served as delegates to the state convention where delegates were chosen for the national convention.
This process rewarded candidate organizers who not only got supporters to the caucus sites but also got supporters willing to serve as delegates to county conventions and willing to vote for other delegates who supported a specific candidate. In 2012, this process resulted in Ron Paul supporters dominating the Iowa delegation to the Republican National Convention, having 22 of the 28 Iowa delegates, with Mitt Romney getting the other six delegates.
Because the delegates elected at the caucuses are not required to declare a candidate preference, the media does not always have a purely objective way to determine the success of individual candidates at the caucuses. The media focused on the secret ballot polling conducted at the caucus sites and have generally referred to this non-binding poll as the caucus. There were irregularities in the 2012 caucus site polling results, including the fact that eight precinct results went missing and were never counted.
Because of the irregularities in the process and the fact that the totals reported to the media were unrelated to the delegate selection process, there have been changes in both how the caucus site secret ballot polling is sent to state party headquarters and in how Iowa delegates to the national convention are required to vote.
Beginning with the
2012 presidential election, Iowa switched from the old winner-take-all allocation to proportional allocation. The change was made to prolong the race, giving lesser-known candidates a chance and making it harder for a frontrunner to secure the majority early. It was also hoped that this change in the election system would energize the base of the party.
Starting in 2016, caucus results have become binding when selecting delegates. Acting in accordance with a mandate from the Republican National Committee, the delegates are bound on the first ballot to vote for candidates in proportion to the votes cast for each candidate at the caucus sites.
History
Since 1972, the Iowa caucuses have had a 55% success rate at predicting which Democrat, and a 43% success rate at predicting which Republican, will go on to win the nomination of their
political party
A political party is an organization that coordinates candidates to compete in a particular area's elections. It is common for the members of a party to hold similar ideas about politics, and parties may promote specific political ideology, ...
for president at that party's national convention.
2004
Since Republican President
George W. Bush
George Walker Bush (born July 6, 1946) is an American politician and businessman who was the 43rd president of the United States from 2001 to 2009. A member of the Bush family and the Republican Party (United States), Republican Party, he i ...
did not face any opposition in 2004, only Democratic caucuses were held. The meetings ran from 6:30 p.m. until approximately 7:00 p.m. on January 19, 2004, with a turnout of about 124,000 caucus-goers. The county convention occurred on March 13, the district convention on April 24, and the state convention on June 26. Delegates could and did change their votes based on further developments in the race; for instance, in 2004 the delegates pledged to Dick Gephardt, who left the race after the precinct caucuses, chose a different candidate to support at the county, district, and state level.
The number of delegates each candidate receives eventually determines how many state delegates from Iowa that candidate will have at the
Democratic National Convention. Iowa sends 56 delegates to the DNC out of a total of 4,366.
Of the 45 delegates that were chosen through the caucus system, 29 were chosen at the district level. Ten delegates were at-large delegates, and six were "party leader and elected official" (PLEO) delegates; these were assigned at the state convention. There were also 11 other delegates, eight of whom were appointed from local Democratic National Committee members; two were PLEO delegates and one was elected at the state Democratic convention.
John Kerry
John Forbes Kerry (born December 11, 1943) is an American attorney, politician, and diplomat who served as the 68th United States secretary of state from 2013 to 2017 in the Presidency of Barack Obama#Administration, administration of Barac ...
won the Iowa caucuses with 38% of the vote,
John Edwards coming second.
2008
The
2008 Iowa Democratic caucuses and
2008 Iowa Republican caucuses took place January 3 at 7 p.m. CT. Candidates spent tens of millions of dollars on local television advertisements and hundreds of paid staff in dozens of field offices.
Barack Obama
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
(D) and
Mike Huckabee (R) were the eventual winners.
2012
The 2012 Iowa caucuses took place on Tuesday, January 3, starting at 7 p.m. CST. Incumbent president
Barack Obama
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
only faced minor opposition in the Democratic caucus and received 98% of the vote,
but the Republican caucus was heavily contested between several challengers. Initial results reported that Mitt Romney beat out Rick Santorum by just 8 votes, but when the final results came out two weeks later Rick Santorum secured the victory over Romney by a margin of 34 votes with Ron Paul in a strong 3rd. Results were certified by the Caucus, but not by the Republican party, who declared it a split decision due to missing reports from 8 precincts,
but who later certified the caucus as a win for Santorum.
The caucus winner changed yet again when the Iowa delegate totals were finally determined giving Ron Paul the win along with several other states that same weekend.
2016

The 2016 Iowa caucuses took place on Monday, February 1. The counting started at 7 p.m. CST and lasted one hour, after the caucus discussions. For the first time, results were electronically sent to both Democratic and Republican headquarters.
In the Democratic caucus,
Hillary Clinton
Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, lawyer and diplomat. She was the 67th United States secretary of state in the administration of Barack Obama from 2009 to 2013, a U.S. senator represent ...
received 45% of the vote and 23 pledged delegates, defeating
Bernie Sanders
Bernard Sanders (born September8, 1941) is an American politician and activist who is the Seniority in the United States Senate, senior United States Senate, United States senator from the state of Vermont. He is the longest-serving independ ...
, with 41% and 21 delegates. The Republican caucus awarded delegates to nine candidates: 8 to
Ted Cruz
Rafael Edward Cruz (; born December 22, 1970) is an American politician and attorney serving as the junior United States senator from Texas since 2013. A member of the Republican Party, Cruz was the solicitor general of Texas from 2003 ...
, with 28% of the vote; 7 each to
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
and
Marco Rubio, with 24% and 23% respectively; 3 to
Ben Carson, with 9%; and 1 delegate each to five other candidates.
2020
The 2020 Iowa caucuses occurred on Monday, February 3. The results of the 2020 Iowa Democratic caucus were delayed due to "inconsistencies in the reporting of three sets of results," according to Mandy McClure, the party's communications director. "In addition to the tech systems being used to tabulate results, we are also using photos of results and a paper trail to validate that all results match and ensure that we have confidence and accuracy in the numbers we report. This is simply a reporting issue, the app did not go down and this is not a hack or an intrusion. The underlying data and paper trail is sound and will simply take time to further report the results."
Delays in reporting were attributed to the failure of a new reporting app for the Iowa Democratic Party presidential caucus, including an inability to download or launch the app as well as an inability for the app to function well once launched; the failure of the backup phone number system after too many people attempted to call the phone number due to the failing app; and confusion over the correct way to count and calculate the initial and final popular votes as well as state delegate equivalent values.
A complete official count of the first alignment popular vote, the second alignment popular vote, and state delegate equivalents was released on February 6, 3 days after Iowa Democrats voted. However, various outlets including ''
The New York Times
''The New York Times'' (''NYT'') is an American daily newspaper based in New York City. ''The New York Times'' covers domestic, national, and international news, and publishes opinion pieces, investigative reports, and reviews. As one of ...
'' and
NBC News
NBC News is the news division of the American broadcast television network NBC. The division operates under NBCUniversal Media Group, a division of NBCUniversal, which is itself a subsidiary of Comcast. The news division's various operations r ...
reported logical inconsistencies in certain precincts (such as state delegate equivalents being awarded to the wrong candidates and more people voting for the second alignment than the first alignment). This led the Democratic National Committee chairman
Tom Perez to request the state Democratic Party (which runs the caucuses) to "recanvass" or recalculate the results including state delegate equivalents.
The app in question was provided by a 5-month-old company,
Shadow Inc., which failed to develop and test the product adequately. The CEO and founder,
Tara McGowan, also founded the
ACRONYM
An acronym is a type of abbreviation consisting of a phrase whose only pronounced elements are the initial letters or initial sounds of words inside that phrase. Acronyms are often spelled with the initial Letter (alphabet), letter of each wor ...
corporation in 2017 and
Courier Newsroom in 2019. Her husband, Michael Halle, is a senior strategist to the campaign of Pete Buttigieg. Multiple unverified claims of the Buttigieg campaign funding the organization, having investment interests in, and even sharing partial ownership in either company have been made. However, the only verified transactions between the Buttigieg campaign and either entity is a contract for text and messages services. The Joe Biden campaign had also contracted with Shadow, Inc for the same services, as well as former candidate Kirsten Gillibrand. After the app failure, McGowan distanced herself and ACRONYM from Shadow Inc., stating that it was an "independent" entity. Both companies are founded and directed by McGowan and Halle, and they share the same registered address. While the corporation's official website doesn't officially name its members, data gathered from LinkedIn reveals that its top executives were all involved in one way or another with Hillary Clinton's 2016 election campaign. James Hickey (Shadow, Inc.'s Chief Operating Officer) and Krista Davis (its Chief Software Architect) were both vital to the digital aspect of her campaign.
2024
The 2024 Iowa Republican presidential caucuses were held on January 15, 2024, with 40 delegates to the
2024 Republican National Convention allocated on a proportional basis. The winner was
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
, followed by
Ron DeSantis and
Nikki Haley.
Iowa's Democratic presidential caucuses had in-person gatherings on January 15 focusing only on party business. Voting on candidates will be done exclusively via
mail-in ballots from January 12 until
Super Tuesday, March 5, 2024. This was the result of a compromise between the Iowa Democratic Party and the Democratic National Committee. Iowa traditionally holds its race first during the presidential primary and caucuses season, but the DNC originally wanted South Carolina to instead hold its race first on February 3. 46 delegates to the
Democratic National Convention will be allocated to presidential candidates.
Democratic results
Notes: An asterisk indicates a write-in candidate. Candidates in bold won the primary. Candidates in ''italics'' were incumbent presidents.
*
1972
Within the context of Coordinated Universal Time (UTC) it was the longest year ever, as two leap seconds were added during this 366-day year, an event which has not since been repeated. (If its start and end are defined using Solar time, ...
(January 24): "Uncommitted" (36%),
Edmund Muskie (36%),
George McGovern (23%),
Hubert Humphrey (2%),
Eugene McCarthy (1%),
Shirley Chisholm (1%), and
Henry M. Jackson (1%)
*
1976
Events January
* January 2 – The International Covenant on Economic, Social and Cultural Rights enters into force.
* January 5 – The Pol Pot regime proclaims a new constitution for Democratic Kampuchea.
* January 18 – Full diplomatic ...
(January 19): "Uncommitted" (37%),
Jimmy Carter
James Earl Carter Jr. (October 1, 1924December 29, 2024) was an American politician and humanitarian who served as the 39th president of the United States from 1977 to 1981. A member of the Democratic Party (United States), Democratic Party ...
(28%),
Birch Bayh
Birch Evans Bayh Jr. (; January 22, 1928 – March 14, 2019) was an American politician. A member of the Democratic Party (United States), Democratic Party, he served as a member of United States Senate from 1963 to 1981. He was first elected t ...
(13%),
Fred R. Harris (10%),
Morris Udall (6%),
Sargent Shriver (3%), and
Henry M. Jackson (1%)
*
1980
Events January
* January 4 – U.S. President Jimmy Carter proclaims a United States grain embargo against the Soviet Union, grain embargo against the USSR with the support of the European Commission.
* January 6 – Global Positioning Sys ...
(January 21): ''
Jimmy Carter
James Earl Carter Jr. (October 1, 1924December 29, 2024) was an American politician and humanitarian who served as the 39th president of the United States from 1977 to 1981. A member of the Democratic Party (United States), Democratic Party ...
'' (59%) and
Ted Kennedy (31%)
*
1984 (February 20):
Walter Mondale
Walter Frederick "Fritz" Mondale (January 5, 1928April 19, 2021) was the 42nd vice president of the United States serving from 1977 to 1981 under President Jimmy Carter. He previously served as a U.S. senator from Minnesota from 1964 to 1976. ...
(49%),
Gary Hart (17%),
George McGovern (10%),
Alan Cranston
Alan MacGregor Cranston (June 19, 1914 – December 31, 2000) was an American politician and journalist who served as a United States Senate, United States Senator from California from 1969 to 1993, and as President of the Citizens for Global S ...
(7%),
John Glenn
John Herschel Glenn Jr. (July 18, 1921 – December 8, 2016) was an American Marine Corps aviator, astronaut, businessman, and politician. He was the third American in space and the first to orbit the Earth, circling it three times in 1 ...
(4%),
Reubin Askew (3%), and
Jesse Jackson (2%)
*
1988 (February 8):
Dick Gephardt
Richard Andrew Gephardt (; born January 31, 1941) is an American attorney, lobbyist, and politician who represented in the United States House of Representatives from 1977 to 2005. A member of the Democratic Party, he was House majority lead ...
(31%),
Paul Simon
Paul Frederic Simon (born October 13, 1941) is an American singer-songwriter known for his solo work and his collaborations with Art Garfunkel. He and Garfunkel, whom he met in elementary school in 1953, came to prominence in the 1960s as Sim ...
(27%),
Michael Dukakis (22%),
Jesse Jackson (9%), and
Bruce Babbitt (6%)
*
1992
1992 was designated as International Space Year by the United Nations.
Events January
* January 1 – Boutros Boutros-Ghali of Egypt replaces Javier Pérez de Cuéllar of Peru as United Nations Secretary-General.
* January 6
** The Republ ...
(February 10):
Tom Harkin (76%), "Uncommitted" (12%),
Paul Tsongas (4%),
Bill Clinton
William Jefferson Clinton (né Blythe III; born August 19, 1946) is an American politician and lawyer who was the 42nd president of the United States from 1993 to 2001. A member of the Democratic Party (United States), Democratic Party, ...
(3%),
Bob Kerrey (2%), and
Jerry Brown
Edmund Gerald Brown Jr. (born April 7, 1938) is an American lawyer, author, and politician who served as the 34th and 39th governor of California from 1975 to 1983 and 2011 to 2019. A member of the Democratic Party (United States), Democratic P ...
(2%)
*
1996 (February 12): ''
Bill Clinton
William Jefferson Clinton (né Blythe III; born August 19, 1946) is an American politician and lawyer who was the 42nd president of the United States from 1993 to 2001. A member of the Democratic Party (United States), Democratic Party, ...
'' (98%), "Uncommitted" (1%), and
Ralph Nader (1%)
*
2000
2000 was designated as the International Year for the Culture of Peace and the World Mathematics, Mathematical Year.
Popular culture holds the year 2000 as the first year of the 21st century and the 3rd millennium, because of a tende ...
(January 24):
Al Gore
Albert Arnold Gore Jr. (born March 31, 1948) is an American former politician, businessman, and environmentalist who served as the 45th vice president of the United States from 1993 to 2001 under President Bill Clinton. He previously served as ...
(63%) and
Bill Bradley (37%)
*
2004
2004 was designated as an International Year of Rice by the United Nations, and the International Year to Commemorate the Struggle Against Slavery and Its Abolition (by UNESCO).
Events January
* January 3 – Flash Airlines Flight 60 ...
(January 19):
John Kerry
John Forbes Kerry (born December 11, 1943) is an American attorney, politician, and diplomat who served as the 68th United States secretary of state from 2013 to 2017 in the Presidency of Barack Obama#Administration, administration of Barac ...
(38%),
John Edwards (32%),
Howard Dean
Howard Brush Dean III (born November 17, 1948) is an American physician, author, consultant, and retired politician who served as the 79th governor of Vermont from 1991 to 2003 and chair of the Democratic National Committee (DNC) from 2005 to 20 ...
(18%),
Dick Gephardt
Richard Andrew Gephardt (; born January 31, 1941) is an American attorney, lobbyist, and politician who represented in the United States House of Representatives from 1977 to 2005. A member of the Democratic Party, he was House majority lead ...
(11%), and
Dennis Kucinich
Dennis John Kucinich ( ; October 8, 1946) is an American politician. Originally a Democratic Party (United States), Democrat, Kucinich served as U.S. Representative from Ohio's Ohio's 10th congressional district, 10th congressional district fro ...
(1%)
*
2008 (January 3):
Barack Obama
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
(38%),
John Edwards (30%),
Hillary Clinton
Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, lawyer and diplomat. She was the 67th United States secretary of state in the administration of Barack Obama from 2009 to 2013, a U.S. senator represent ...
(29%),
Bill Richardson (2%), and
Joe Biden
Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who was the 46th president of the United States from 2021 to 2025. A member of the Democratic Party (United States), Democratic Party, he served as the 47th vice p ...
(1%)
*
2012
2012 was designated as:
*International Year of Cooperatives
*International Year of Sustainable Energy for All
Events January
*January 4 – The Cicada 3301 internet hunt begins.
* January 12 – Peaceful protests begin in the R ...
(January 3): ''
Barack Obama
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
'' (98%) and "Uncommitted" (2%)
*
2016
2016 was designated as:
* International Year of Pulses by the sixty-eighth session of the United Nations General Assembly.
* International Year of Global Understanding (IYGU) by the International Council for Science (ICSU), the Internationa ...
(February 1):
Hillary Clinton
Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, lawyer and diplomat. She was the 67th United States secretary of state in the administration of Barack Obama from 2009 to 2013, a U.S. senator represent ...
(50%),
Bernie Sanders
Bernard Sanders (born September8, 1941) is an American politician and activist who is the Seniority in the United States Senate, senior United States Senate, United States senator from the state of Vermont. He is the longest-serving independ ...
(49%), and
Martin O'Malley (1%)
*
2020
The year 2020 was heavily defined by the COVID-19 pandemic, which led to global Social impact of the COVID-19 pandemic, social and Economic impact of the COVID-19 pandemic, economic disruption, mass cancellations and postponements of even ...
(February 3):
**State Delegate Equivalents:
Pete Buttigieg (26%),
Bernie Sanders
Bernard Sanders (born September8, 1941) is an American politician and activist who is the Seniority in the United States Senate, senior United States Senate, United States senator from the state of Vermont. He is the longest-serving independ ...
(26%),
Elizabeth Warren (18%),
Joe Biden
Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who was the 46th president of the United States from 2021 to 2025. A member of the Democratic Party (United States), Democratic Party, he served as the 47th vice p ...
(16%),
Amy Klobuchar (12%), and others (2%)
**Delegates:
Pete Buttigieg (14),
Bernie Sanders
Bernard Sanders (born September8, 1941) is an American politician and activist who is the Seniority in the United States Senate, senior United States Senate, United States senator from the state of Vermont. He is the longest-serving independ ...
(12),
Elizabeth Warren (8),
Joe Biden
Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who was the 46th president of the United States from 2021 to 2025. A member of the Democratic Party (United States), Democratic Party, he served as the 47th vice p ...
(6),
Amy Klobuchar (1), and others (0)
**First Round Popular Vote:
Bernie Sanders
Bernard Sanders (born September8, 1941) is an American politician and activist who is the Seniority in the United States Senate, senior United States Senate, United States senator from the state of Vermont. He is the longest-serving independ ...
(25%),
Pete Buttigieg (21%),
Elizabeth Warren (18%),
Joe Biden
Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who was the 46th president of the United States from 2021 to 2025. A member of the Democratic Party (United States), Democratic Party, he served as the 47th vice p ...
(15%),
Amy Klobuchar (13%),
Andrew Yang (5%),
Tom Steyer (2%), and others (1%)
**Second Round Popular Vote:
Bernie Sanders
Bernard Sanders (born September8, 1941) is an American politician and activist who is the Seniority in the United States Senate, senior United States Senate, United States senator from the state of Vermont. He is the longest-serving independ ...
(27%),
Pete Buttigieg (25%),
Elizabeth Warren (20%),
Joe Biden
Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who was the 46th president of the United States from 2021 to 2025. A member of the Democratic Party (United States), Democratic Party, he served as the 47th vice p ...
(14%),
Amy Klobuchar (12%),
Andrew Yang (1%), uncommitted (1%), and others (0%)
*
2024
The year saw the list of ongoing armed conflicts, continuation of major armed conflicts, including the Russian invasion of Ukraine, the Myanmar civil war (2021–present), Myanmar civil war, the Sudanese civil war (2023–present), Sudane ...
(March 5): ''
Joe Biden
Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who was the 46th president of the United States from 2021 to 2025. A member of the Democratic Party (United States), Democratic Party, he served as the 47th vice p ...
'' (90%) and "Uncommitted" (4%)
Republican results
Notes: An asterisk indicates a write-in candidate. Candidates in bold won the primary. Candidates in ''italics'' were incumbent presidents.
*
1976
Events January
* January 2 – The International Covenant on Economic, Social and Cultural Rights enters into force.
* January 5 – The Pol Pot regime proclaims a new constitution for Democratic Kampuchea.
* January 18 – Full diplomatic ...
(January 19): ''
Gerald Ford
Gerald Rudolph Ford Jr. (born Leslie Lynch King Jr.; July 14, 1913December 26, 2006) was the 38th president of the United States, serving from 1974 to 1977. A member of the Republican Party (United States), Republican Party, Ford assumed the p ...
'' (45%) and
Ronald Reagan
Ronald Wilson Reagan (February 6, 1911 – June 5, 2004) was an American politician and actor who served as the 40th president of the United States from 1981 to 1989. He was a member of the Republican Party (United States), Republican Party a ...
(43%)
*
1980
Events January
* January 4 – U.S. President Jimmy Carter proclaims a United States grain embargo against the Soviet Union, grain embargo against the USSR with the support of the European Commission.
* January 6 – Global Positioning Sys ...
(January 21):
George H. W. Bush
George Herbert Walker BushBefore the outcome of the 2000 United States presidential election, he was usually referred to simply as "George Bush" but became more commonly known as "George H. W. Bush", "Bush Senior," "Bush 41," and even "Bush th ...
(32%),
Ronald Reagan
Ronald Wilson Reagan (February 6, 1911 – June 5, 2004) was an American politician and actor who served as the 40th president of the United States from 1981 to 1989. He was a member of the Republican Party (United States), Republican Party a ...
(30%),
Howard Baker (15%),
John Connally (9%),
Phil Crane (7%),
John B. Anderson (4%), and
Bob Dole
Robert Joseph Dole (July 22, 1923 – December 5, 2021) was an American politician and attorney who represented Kansas in the United States Senate from 1969 to 1996. He was the Party leaders of the United States Senate, Republican Leader of th ...
(2%)
*
1984 (February 20): ''
Ronald Reagan
Ronald Wilson Reagan (February 6, 1911 – June 5, 2004) was an American politician and actor who served as the 40th president of the United States from 1981 to 1989. He was a member of the Republican Party (United States), Republican Party a ...
'' (unopposed)
*
1988 (February 8):
Bob Dole
Robert Joseph Dole (July 22, 1923 – December 5, 2021) was an American politician and attorney who represented Kansas in the United States Senate from 1969 to 1996. He was the Party leaders of the United States Senate, Republican Leader of th ...
(37%),
Pat Robertson (25%),
George H. W. Bush
George Herbert Walker BushBefore the outcome of the 2000 United States presidential election, he was usually referred to simply as "George Bush" but became more commonly known as "George H. W. Bush", "Bush Senior," "Bush 41," and even "Bush th ...
(19%),
Jack Kemp
Jack French Kemp (July 13, 1935 – May 2, 2009) was an American politician, professional Gridiron football, football player, and U.S. Army veteran. A member of the Republican Party (United States), Republican Party from New York, he served a ...
(11%), and
Pete DuPont (7%)
*
1992
1992 was designated as International Space Year by the United Nations.
Events January
* January 1 – Boutros Boutros-Ghali of Egypt replaces Javier Pérez de Cuéllar of Peru as United Nations Secretary-General.
* January 6
** The Republ ...
(February 10): ''
George H. W. Bush
George Herbert Walker BushBefore the outcome of the 2000 United States presidential election, he was usually referred to simply as "George Bush" but became more commonly known as "George H. W. Bush", "Bush Senior," "Bush 41," and even "Bush th ...
'' (unopposed)
*
1996 (February 12):
Bob Dole
Robert Joseph Dole (July 22, 1923 – December 5, 2021) was an American politician and attorney who represented Kansas in the United States Senate from 1969 to 1996. He was the Party leaders of the United States Senate, Republican Leader of th ...
(26%),
Pat Buchanan (23%),
Lamar Alexander (18%),
Steve Forbes
Malcolm Stevenson Forbes Jr. (; born July 18, 1947) is an American publishing executive and politician who is the editor-in-chief of ''Forbes'', a business magazine. He is the son of longtime ''Forbes'' publisher Malcolm Forbes and the grandso ...
(10%),
Phil Gramm
William Philip Gramm (born July 8, 1942) is an American economist and politician who represented Texas in both chambers of United States Congress, Congress. Though he began his political career as a Democratic Party (United States), Democrat, Gr ...
(9%),
Alan Keyes
Alan Lee Keyes (born August 7, 1950) is an American politician, political scientist, and perennial candidate who served as the Assistant Secretary of State for International Organization Affairs from 1985 to 1987. A member of the Republican P ...
(7%),
Richard Lugar (4%), and
Morry Taylor (1%)
*
2000
2000 was designated as the International Year for the Culture of Peace and the World Mathematics, Mathematical Year.
Popular culture holds the year 2000 as the first year of the 21st century and the 3rd millennium, because of a tende ...
(January 24):
George W. Bush
George Walker Bush (born July 6, 1946) is an American politician and businessman who was the 43rd president of the United States from 2001 to 2009. A member of the Bush family and the Republican Party (United States), Republican Party, he i ...
(41%),
Steve Forbes
Malcolm Stevenson Forbes Jr. (; born July 18, 1947) is an American publishing executive and politician who is the editor-in-chief of ''Forbes'', a business magazine. He is the son of longtime ''Forbes'' publisher Malcolm Forbes and the grandso ...
(31%),
Alan Keyes
Alan Lee Keyes (born August 7, 1950) is an American politician, political scientist, and perennial candidate who served as the Assistant Secretary of State for International Organization Affairs from 1985 to 1987. A member of the Republican P ...
(14%),
Gary Bauer (9%),
John McCain
John Sidney McCain III (August 29, 1936 – August 25, 2018) was an American statesman and United States Navy, naval officer who represented the Arizona, state of Arizona in United States Congress, Congress for over 35 years, first as ...
(5%), and
Orrin Hatch (1%)
*
2004
2004 was designated as an International Year of Rice by the United Nations, and the International Year to Commemorate the Struggle Against Slavery and Its Abolition (by UNESCO).
Events January
* January 3 – Flash Airlines Flight 60 ...
(January 19): ''
George W. Bush
George Walker Bush (born July 6, 1946) is an American politician and businessman who was the 43rd president of the United States from 2001 to 2009. A member of the Bush family and the Republican Party (United States), Republican Party, he i ...
'' (unopposed)
*
2008 (January 3):
Mike Huckabee (34%),
Mitt Romney
Willard Mitt Romney (born March 12, 1947) is an American businessman and retired politician. He served as a United States Senate, United States senator from Utah from 2019 to 2025 and as the 70th governor of Massachusetts from 2003 to 2007 ...
(25%),
Fred Thompson (13%),
John McCain
John Sidney McCain III (August 29, 1936 – August 25, 2018) was an American statesman and United States Navy, naval officer who represented the Arizona, state of Arizona in United States Congress, Congress for over 35 years, first as ...
(13%),
Ron Paul (10%),
Rudy Giuliani
Rudolph William Louis Giuliani ( , ; born May 28, 1944) is an American politician and Disbarment, disbarred lawyer who served as the 107th mayor of New York City from 1994 to 2001. He previously served as the United States Associate Attorney ...
(4%), and
Duncan Hunter (1%)
*
2012
2012 was designated as:
*International Year of Cooperatives
*International Year of Sustainable Energy for All
Events January
*January 4 – The Cicada 3301 internet hunt begins.
* January 12 – Peaceful protests begin in the R ...
(January 3):
Rick Santorum (25%),
Mitt Romney
Willard Mitt Romney (born March 12, 1947) is an American businessman and retired politician. He served as a United States Senate, United States senator from Utah from 2019 to 2025 and as the 70th governor of Massachusetts from 2003 to 2007 ...
(25%),
Ron Paul (21%),
Newt Gingrich
Newton Leroy Gingrich (; né McPherson; born June 17, 1943) is an American politician and author who served as the List of speakers of the United States House of Representatives, 50th speaker of the United States House of Representatives from 1 ...
(13%),
Rick Perry (10%),
Michele Bachmann (5%), and
Jon Huntsman (1%)
*
2016
2016 was designated as:
* International Year of Pulses by the sixty-eighth session of the United Nations General Assembly.
* International Year of Global Understanding (IYGU) by the International Council for Science (ICSU), the Internationa ...
(February 1):
Ted Cruz
Rafael Edward Cruz (; born December 22, 1970) is an American politician and attorney serving as the junior United States senator from Texas since 2013. A member of the Republican Party, Cruz was the solicitor general of Texas from 2003 ...
(28%),
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
(24%),
Marco Rubio (23%),
Ben Carson (9%),
Rand Paul
Randal Howard Paul (born January 7, 1963) is an American politician serving as the Seniority in the United States Senate, junior United States senator from Kentucky since 2011.
A member of the Republican Party (United States), Republican ...
(5%),
Jeb Bush (3%),
Carly Fiorina
Cara Carleton "Carly" Fiorina (; ; born September 6, 1954) is an American businesswoman and politician, known primarily for her tenure as chief executive officer (CEO) of Hewlett-Packard (HP) from 1999 to 2005. Fiorina was the first woman to le ...
(2%), and others (7%)
*
2020
The year 2020 was heavily defined by the COVID-19 pandemic, which led to global Social impact of the COVID-19 pandemic, social and Economic impact of the COVID-19 pandemic, economic disruption, mass cancellations and postponements of even ...
(February 3): ''
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
'' (97%),
Bill Weld (1%),
Joe Walsh (1%), and others (1%)
*
2024
The year saw the list of ongoing armed conflicts, continuation of major armed conflicts, including the Russian invasion of Ukraine, the Myanmar civil war (2021–present), Myanmar civil war, the Sudanese civil war (2023–present), Sudane ...
(January 15):
Donald Trump
Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
(51%),
Ron DeSantis (21%),
Nikki Haley (19%),
Vivek Ramaswamy (8%), and others (1%)
See also
*
United States presidential election
The election of the president of the United States, president and Vice President of the United States, vice president of the United States is an indirect election in which citizens of the United States who are Voter registration in the United ...
*
Iowa Straw Poll
Notes
Further reading
* Hull, Christopher C. 2007. ''Grassroots Rules: How The Iowa Caucus Helps Elect American Presidents''. Stanford, CA
Stanford University Press* Redlawsk, David P., Caroline J. Tolbert, and Todd Donovan, 2011. ''Why Iowa?: How Caucuses and Sequential Elections Improve the Presidential Nominating Process.'' Chicago
University of Chicago Presswww.whyiowa.org* Skipper, John C., 2009. ''The Iowa Caucuses: First Test of Presidential Aspirations, 1972–2008''. McFarland Publishing, Jefferson, NC.
* Squire, Peverill, ed. 1989. ''The Iowa Caucuses and the Presidential Nominating Process''. Boulder, CO: Westview Press.
* Winebrenner, Hugh. 1998. ''The Iowa Precinct Caucuses: The Making of a Media Event''. 2nd ed. Ames: Iowa State University Press.
External links
Iowa presidential election statistics at CountingTheVotes.com2012 Iowa Caucuses websiteIowa Caucus 2016 via The GazetteLearn how to caucus: Farm bureau tutorialWebsite for the Iowa Caucuses (Democrats)
{{United States presidential elections, state=expanded