EN
The aim of the article is to analyze the formation of electoral preferences during the accession referendum to the European Union and in individual electorates to the European Parliament in constituency no. 13 - which includes the West Pomeranian and Lubusz Voivodeships - compared to all-Poland results. Both in the 1990s and at the beginning of the 21st century, the inhabitants of both regions demonstrated leftist electoral preferences. The change in electoral behavior took place during the first EP elections, and then proceeded in subsequent elections not only to the European Parliament, but also to the national parliament, as well elections of the President of the Republic of Poland and local authorities. Thanks to a comparative analysis of individual elections, it will be possible to verify the hypothesis that in the analyzed voivodeships included in constituency no.13 there was a change from leftist electoral preferences towards the center of the political scene.