Since the 1980s a growing number of populist parties have made a breakthrough in European party systems. Examples of these are the Belgian Vlaams Belang (VB), the Lijst Pim Fortuyn (LPF) in the Netherlands or the German Die Linke (DL). All of these parties can considered to be populist because they share a thin centred ideology “that considers society ultimately separated into two homogeneous and antagonistic groups, ‘the pure people’ versus ‘the corrupt elite’, and which argues that politics should be an expression of the volonté générale (general will) of the people” (Mudde, 2004: 543). This thin centred ideology can be combined with other full ideologies such as the radical right but also democratic socialism. The main objective of this study is to explain why people vote for populist parties. Such a question is difficult to answer, however, because populism is mostly attached to other ideologies. To address this problem, this study draws on a comparative research design. By studying the electorates of a wide range of different populist parties, it is disentangled what is exactly the populist element, rather than elements related to the host ideology, that drives voters towards these parties. The study begins with a careful investigation of all parties in Belgium, The Netherlands and Germany by means of both qualitative and quantitative methods to explore which of them could be labelled populist. Support was found for at least the following cases: LPF, the Belgian Lijst Dedecker (LDD), the Dutch Partij Voor de Vrijheid (PVV), VB, the Dutch Socialistische Partij (SP) and DL. In a next step, the voters of these parties were analyzed by means of election survey data (Dutch Parliamentary Election Study, Partirep Survey and German Longitudinal Election Study). The main finding of is that dissatisfaction with the functioning of democracy and a desire for more decision making through referendums are important and unique drivers for populist voting in general. On the demand side it is argued that a process of ...