Elections to the Senate are rarely a topic of deep analysis by media or researchers. The Upper House of the Parliament is not a place where key political decisions are made. The Government, which is appointed by the majority of the Lower House, the Sejm, is the center of Polish political life. Experience show that the political situation in the Senate is much more stable than in the Sejm. From 1997, parties which won elections to the Sejm always had a majority in the Senate, although none of these parties had an independent majority in the Sejm. The 2007 elections crown this trend – only one mandate in the Senate was given to a candidate who did not come from the winning party or any main opposition parties. Every fifth mandate in the Lower House was given to smaller parties. The purpose of this analysis is to find an answer to the question on what leads to such results.