Replication Data for: Evelien Willems & Jan Beyers (2022). Public support and advocacy success across the legislative process. European Journal of Political Research

This paper examines how public support affects interest groups’ advocacy success across three distinct stages in the legislative process. We hypothesize that public support is vital for advocacy success when coalition agreements are negotiated, has a weaker effect when legislation is introduced in parliament by the governing majority but becomes again stronger when legislation is adopted. We assess these expectations for 55 Belgian policy issues. We combine evidence on legislative outcomes with public opinion data and a mapping of interest groups’ positions in the news. The results indicate that public support is key for advocacy success in the coalition agreement. However, the positive effect of public support weakens when legislation is introduced in parliament—the effect only materializes for initiatives by the opposition—and public support has no significant effect on advocacy success in adopted legislation. Instead, aligning with other groups and political parties becomes more consequential for advocacy success in later legislative stages. Still, on average, interest groups attaining their preferences in adopted legislation enjoy considerable public support. Our results thus underscore the relevance of distinguishing between legislative stages when analyzing interest groups’ advocacy success.