The Unitary Democratic Coalition (, CDU) is an
electoral and
political coalition
A parliamentary group, parliamentary caucus or political group is a group consisting of members of different political parties or independent politicians with similar ideologies. Some parliamentary systems allow smaller political parties, who a ...
between the
Portuguese Communist Party
The Portuguese Communist Party (, , PCP) is a Communism, communist and Marxism–Leninism, Marxist–Leninist List of political parties in Portugal, political party in Portugal. It is one of the strongest List of communist parties, communist par ...
() and the
Ecologist Party "The Greens" (
Portuguese: Partido Ecologista "Os Verdes" or PEV). The coalition also integrates the political movement
Democratic Intervention ().
The coalition was formed in 1987 in order to run to the simultaneous
legislative election and
European Parliament election that were held on July 19 of that year. It achieved its best result in the 1987 elections both nationally and locally. From
1991
It was the final year of the Cold War, which had begun in 1947. During the year, the Soviet Union Dissolution of the Soviet Union, collapsed, leaving Post-soviet states, fifteen sovereign republics and the Commonwealth of Independent State ...
until
2019
This was the year in which the first known human case of COVID-19 was documented, preceding COVID-19 pandemic, the pandemic which was declared by the World Health Organization the following year.
Up to that point, 2019 had been described as ...
, the party consistently won between six and ten percent of the national vote in elections to the
Assembly of the Republic until
2022
The year began with another wave in the COVID-19 pandemic, with SARS-CoV-2 Omicron variant, Omicron spreading rapidly and becoming the dominant variant of the SARS-CoV-2 virus worldwide. Tracking a decrease in cases and deaths, 2022 saw ...
and
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 ...
, in which the coalition dropped below 5% nationally for the first time. The coalition supported the minority Socialist
Costa Government from 2015 until 2019 with a
confidence and supply
In parliamentary system, parliamentary democracies based on the Westminster system, confidence and supply is an arrangement under which a minority government (one which does not control a majority in the legislature) receives the support of one ...
agreement.
History
Since the beginning of the coalition, the member parties have never participated separately in any election. The Communist Party is the major force of the coalition and has the majority of places in the electoral lists while the Greens are a smaller party. For example, the Greens were responsible for 2
members of parliament among the 17 elected by the coalition in the
2015 legislative election. Each party has its own parliamentary group and counts as a separate party in official issues.
Along with the
Left Bloc, the coalition supported the minority
Socialist
Socialism is an economic ideology, economic and political philosophy encompassing diverse Economic system, economic and social systems characterised by social ownership of the means of production, as opposed to private ownership. It describes ...
Costa Government from 2015 until 2019 under a
confidence and supply
In parliamentary system, parliamentary democracies based on the Westminster system, confidence and supply is an arrangement under which a minority government (one which does not control a majority in the legislature) receives the support of one ...
agreement. This was known as the "Geringonça" (''Contraption'') deal, a setup that Prime minister António Costa decided to end following the
2019 elections
The following elections were scheduled to occur in 2019. The International Foundation for Electoral Systems has a calendar of upcoming elections around the world, and the National Democratic Institute also maintains a calendar of elections in cou ...
.
In the 2022 election, the CDU won six seats while the Greens achieved zero seats. In the
2024 election, the CDU won four seats and the Greens zero, with the coalition achieving just 3.3 percent of the votes. In 2024, the coalition lost their historic seat in the
Beja district and for the first time lost all MPs in the
Alentejo
Alentejo ( , , ) is a geographical, historical, and cultural region of south–central and southern Portugal. In Portuguese, its name means "beyond the Tagus" ().
Alentejo includes the regions of Alto Alentejo Province, Alto Alentejo and Bai ...
region.
Symbol
The present symbol of CDU shows the PCP's symbol and the PEV's symbol, a
hammer and sickle and a
sunflower
The common sunflower (''Helianthus annuus'') is a species of large annual forb of the daisy family Asteraceae. The common sunflower is harvested for its edible oily seeds, which are often eaten as a snack food. They are also used in the pr ...
, respectively, with the respective names below. That symbol replaced a former one that featured three hexagons with the inscription: CDU and was often used with a beehive. That was sometimes said to mean that CDU worked just like a bee (collectively and every day) and the hexagons were meant to represent the cell-based
Leninist
Leninism (, ) is a political ideology developed by Russian Marxist revolutionary Vladimir Lenin that proposes the establishment of the Dictatorship of the proletariat#Vladimir Lenin, dictatorship of the proletariat led by a revolutionary Vangu ...
organization of the PCP.
File:CDU Portugal 1987.png, Coalition logo in 1987.
File:PCP-PEV.svg, Current logo of the coalition.
Youth organization
The coalition has a youth wing, called
Juventude CDU, that develops political work in youth related subjects, along with youth-oriented activities, mainly during the electoral campaigns. The Juventude CDU is mainly composed by members of the youth wings of the parties that compose the CDU, the
Portuguese Communist Youth and the Ecolojovem.
Election results
Assembly of the Republic

Vote share in the Portuguese legislative elections
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Colors =
id:CDU value:red legend:CDU
DateFormat = x.y
Period = from:0 till:15
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ScaleMajor = unit:year increment:5 start:0
PlotData =
bar:Seats color:claret width:25 mark:(line,white) align:left fontsize:S
bar:1987 color:CDU from:start till:12.1 text:12.1
bar:1991 color:CDU from:start till:8.8 text:8.8
bar:1995 color:CDU from:start till:8.6 text:8.6
bar:1999 color:CDU from:start till:9.0 text:9.0
bar:2002 color:CDU from:start till:6.9 text:6.9
bar:2005 color:CDU from:start till:7.5 text:7.5
bar:2009 color:CDU from:start till:7.9 text:7.9
bar:2011 color:CDU from:start till:7.9 text:7.9
bar:2015 color:CDU from:start till:8.3 text:8.3
bar:2019 color:CDU from:start till:6.3 text:6.3
bar:2022 color:CDU from:start till:4.3 text:4.3
bar:2024 color:CDU from:start till:3.2 text:3.2
bar:2025 color:CDU from:start till:2.9 text:2.9
Presidential
European Parliament
Regional Assemblies
Local elections
Notes
References
External links
CDU Official SitePortuguese Communist Party Official Site"The Greens" Official Site
{{Authority control
1987 establishments in Portugal
Communist parties in Portugal
Eco-socialist parties
Euroscepticism in Portugal
Left-wing political party alliances
Political parties established in 1987
Political party alliances in Portugal
Portuguese Communist Party