2005 Polish parliamentary election
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| Opinion polls | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Registered | 30,229,031 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sejm | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
All 460 seats in the Sejm 231 seats needed for a majority | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Turnout | 12,244,903 (40.57%) 5.72pp | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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All 100 seats in the Senate 51 seats needed for a majority | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Turnout | 12,239,019 (40.49%) 5.66pp | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This lists parties that won seats. See the complete results below.
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Parliamentary elections were held in Poland on 25 September 2005. All 460 members of the Sejm and 100 senators of the Senate were elected. The election resulted in a sweeping victory for two opposition parties: the right-wing, national-conservative Law and Justice (PiS) and the centre-right, liberal-conservative Civic Platform (PO). The incumbent centre-left government of the Democratic Left Alliance (SLD) was soundly defeated. PiS won 155 seats and PO 133, while the governing SLD was reduced to fourth place with 55 seats, behind Andrzej Lepper's Self-Defence party, which won 56 seats.
Normally, this would have made PiS leader Jarosław Kaczyński Prime Minister. However, he declined the post so as not to prejudice his twin brother Lech's chances for the presidential election held later in October. In his place, Law and Justice nominated Kazimierz Marcinkiewicz for the post. Outgoing Prime Minister Marek Belka failed to win a seat in Łódź.
In the Senate, PiS won 49 seats and PO 34 of the 100 seats, leaving eight other parties with the remaining 17 seats. The SLD won no seats in the Senate.
In the subsequent presidential elections, Lech Kaczyński of the PiS defeated PO leader Donald Tusk.