Civic Platform is a member of the European People's Party (EPP).
In the 2001 general election the party scored 12.6% and won 58 deputies in the Sejm, making it the largest party in opposition to the government led by the Democratic Left Alliance.
In 2005, the PO led all opinion polls with 26% to 30% support, however in the 2005 general election, in which it was led by Jan Rokita, the PO scored 24.1% and came second only to Law and Justice (PiS), which took 27,0%. A coalition of PO and PiS was expected to be the most likely government to form after the election. The putative coalition parties had a falling out, however, related to the fierce contest for the Polish presidency.
In the end, Lech Kaczyński (PiS) won the second round of the presidential election on 23 October 2005 with 54.0% of the vote, ahead of Donald Tusk, the PO candidate. As a result, PiS chose instead to govern with the support of the Christian-nationalist League of Polish Families and the agrarian-populist Self-Defense of the Republic of Poland parties. The PO became the Opposition to this PiS-led coalition government.
This coalition fell apart in 2007 amid corruption scandals and internal leadership disputes. These events led to the new elections. In the 21 October 2007 National Assembly election, the party won 41.51 % of the popular vote and 209 out of 460 seats in the Sejm and 60 out of 100 seats in the Senate of Poland. Civic Platform defeated the PiS in these elections and subsequently formed a government along with the People's Party.
Core proposals in the party program include: