During electoral campaigns, the use of voting advice applications (VAAs) has become increasingly widespread. Consequently, scholars have examined both the patterns of usage and their effects on voting behaviour. However, existing studies lead to conflicting findings. In this article, we take a closer look at the effect of De Stemtest/Test électoral (a VAA developed by academics from the University of Louvain and the University of Antwerp, in partnership with Belgian media partners) on vote switching. More specifically, we divide this latter question into two sub-questions: (1) What is the impact of a (dis)confirming advice from the VAA on vote switching? (2) Do VAA users follow the voting advice provided by the VAA? Our study shows that receiving a disconfirming advice from the VAA increases the probability of users to switch their vote choice.

In this article, we propose an in-depth exploration of blank and null ballots in the recent 2018 local elections in Wallonia (Belgium). In the official results, both blank and null ballots are merged together and are classified as invalid votes. After obtaining the authorization to access genuine electoral ballots, we study the votes which were not considered for the composition of local councils in detail. The dataset is a representative sample of 13,243 invalidated ballots from 49 Walloon municipalities. We first describe how many of these invalidated ballots are blank and how many are null votes, as well as the nature of the nulled votes (unintended errors or intentionally spoiled ballots). Second, we dig deeper into the differences between ballots that have been intentionally invalidated by voters (blank votes and intentional null votes) and ballots non-intentionally invalidated. Our results show that most of the ballots (two-thirds) are null ballots and that among them, half are unintentional null ballots. Finally, we show that contextual (socio-demographic and political) factors explain the variations in intentional and unintentional null votes across municipalities.