The main goal of opinion polls is to gather and interpret as much information as possible, which could help us characterise the political arena and to analyse the emerging phenomena and trends. From this perspective opinion polls are one of the best means to look at people’s opinions and social beliefs. It is not easy though to get trustworthy information on Poles’ preferences. Rankings of politicians and political parties differ according to different polling centres. Therefore, the question remains whether opinion polls in election campaigns are really important. They are certainly considered a trustworthy and opinion-forming source of Poles’ preferences by voters.