In this article, we investigate the moderating role of political sophistication on the vote for populist parties in Belgium. Building on the literature about the diverse determinants of populist party support, we investigate whether issue considerations and populism-related motivations play a bigger role in the electoral calculus of politically sophisticated voters.
Using data from the 2019 general elections in Belgium, we focus on the cases of Vlaams Belang (VB) and Parti du Travail de Belgique- Partij van de Arbeid (PTB-PVDA). We find evidence suggesting that political sophistication enhances the impact of populism-related motivations on populist party support, although the effects are contingent on the party. Moreover, we show that, for issue considerations, the moderation effect only comes into play for VB voters: the impact of anti-immigrant considerations is greater at increasing levels of political sophistication.

This study investigates how protest attitudes and ideological considerations affected the 2019 election results in Belgium, and particularly the vote for the radical right-wing populist party Vlaams Belang (VB) and for the radical left-wing populist party Partij van de Arbeid-Parti du Travail de Belgique (PVDA-PTB). Our results confirm that both protest attitudes and ideological considerations play a role to distinguish radical populist voters from mainstream party voters in general. However, when opposed to their second-best choice, we show that particularly protest attitudes matter. Moreover, in comparing radical right- and left-wing populist voters, the article disentangles the respective weight of these drivers on the two ends of the political spectrum. Being able to portray itself as an alternative to mainstream can give these parties an edge among a certain category of voters, albeit this position is also difficult to hold in the long run.