Pre-print, Working paper: This paper analyses the electoral cleavages in three Central European countries countries-the Czech Republic, Hungary and Poland-since the fall of communism until today. In all three countries, the left has seen a prolonged decline in support. On the other hand, the "populist" parties increased their support and recently attained power in each country. We relate this to specific trajectories of post-communist transition. Former communist parties in Hungary and Poland transformed themselves into socialdemocratic parties. These parties' pro-market policies prevented them from establishing themselves predominantly among a lower-income electorate. Meanwhile, the liberal right in the Czech Republic and Poland became representative of both high-income and high-educated voters. This has opened up space for populist parties and influenced their character, assuming more 'nativist' outlook in Poland and Hungary and more 'centrist' in the Czech Republic.