Issue competition in Western Europe: an introduction

The special issue introduced in this article presents the results of the Issue Competition Comparative Project (ICCP). The project uses issue yield theory to provide a general, comprehensive perspective on issue competition (party competition through issue strategy) that goes beyond the extant focus on specific parties or specific issues. Relying on voter surveys and Twitter data collected in the context of recent elections in six West European countries, we address several key research questions concerning issue competition: (a) whether the strategies of different parties are loyal to classic 20th-century ideological alignments or rather actively challenging them; (b) whether different parties opt for conflict-mobilization or problem-solving issue strategic approaches; (c) whether party adherence to the issue opportunities identified by issue yield theory are rewarded by better electoral performance