Fuente: “Parties and Elections in Europe“
| Party | Ideology | Affiliation | 2009 | Seats | 2005 | Seats | |
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Partido Socialista (PS) Socialist Party |
Social democracy - |
PES, SI 1973 |
36,6% | 96 | 45,1% | 121 |
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Partido Social Democrata (PPD-PSD) Social Democratic Party |
Liberal conservatism; Christian democracy | EPP, CDI 1974 |
29,1% | 78 | 28,7% | 75 |
| Partido Popular (CDS-PP) People’s Party |
Conservatism; Christian democracy - |
EPP, IDU 1974 |
10,5% | 21 | 7,3% | 12 | |
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Bloco de Esquerda (BE) Left Bloc |
Democratic socialism; Anti-capitalism | EL, EACL 1999 |
9,9% | 16 | 6,4% | 8 |
| Coligação Democrática Unitária (CDU) Democratic Unity Coalition |
- - |
- - |
7,9% | 15 | 7,6% | 14 | |
| Partido Comunista Português (PCP) Portuguese Communist Party |
Communism; Marxism-Leninism - |
- 1921 |
- | - | - | 12 | |
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Partido Ecologista Os Verdes (PEV) Ecological Party The Greens |
Green politics - |
EGP, GG 1982 |
- | - | - | 2 |
| Abroad constituencies (undeclared) | - | - | - | 4 | - | - | |
| Others | - | - | 6,0% | - | 4,9% | - | |
| Total | - | - | - | 230 | - | 230 | |
| Turnout | - | - | 60,6% | 65,0% | |||
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