Be there or be square - The impact of participation and performance in the 2017 Dutch TV debates and its coverage on voting behaviour

TV debates are often seen as the most important events that provide the electorate with information about leading candidates and key issues during electoral campaigns. Research provides evidence for various debate effects, showing both a direct and indirect influence on voting decisions. There is, however, only scant evidence on the relative impact of TV debates when examining these effects at the same time. To fill this gap, our study aims to analyse whether and to what extent a candidate's participation in a debate, their performance in the debate or the related media coverage influence the electorate when examined simultaneously. We consider the case of the 2017 Dutch general elections, which offers an almost ideal setting due to the broadcast of several TV debates of different formats and candidate compositions throughout the campaign period. To distinguish the effects of single debates, we use original Dutch panel survey data. We find a weak overall influence of the debates; the most significant effects are decreasing vote intentions for the two main competitors (VVD and PVV) after both candidates refused to participate in the first TV debate, and a 'winner-effect' for one of the two main candidates in a head-to-head debate.