Leader effects in an era of negative politics: Who has a negativity bias?

It is well known that voters’ evaluation of candidates on leadership traits influences their overall candidate assessment and vote choice (i.e., leader effects). It remains unclear, however, whether positive or negative leader trait evaluations are most influential. We argue that especially in current‐day political reality—in which ideological and affective polarization are skyrocketing and the political climate is fueled with negativity, high levels of incivility, and negative campaigning—the negative leader effects outweigh the positive ones. Moreover, we expect this negativity bias in leader effects to be conditioned by partisanship and political dissatisfaction. To test these expectations, we triangulate multiple studies. First, we use data from a multi‐country election survey to examine the relation between perceived leadership traits of real candidates and party preferences, providing observational evidence from the US, the Netherlands, France, and Germany. Second, focusing on the causal mechanism, we test the negativity bias in a survey experiment among American voters. Here, we manipulate how leadership traits (competence, leadership, integrity, empathy) of a fictitious candidate are presented in terms of valence (positive, negative), and test the impact of these cues on voters’ candidate evaluations and vote choices. The findings indicate, as predicted, that negative leader effects influence voters most strongly. Thus, the role of party leaders is mainly a push instead of a pull factor in elections. Additionally, we show that partisanship and political dissatisfaction seem relevant only for candidate evaluations, not for vote choice. This article pushes the field of candidate evaluations forward by examining the dynamics of the negativity bias in leader effects in an era of negative politics.