Chapter 4 deals with the relationship between protest politics and institutional politics. We look both at the link between different forms of participation (including online participation) as well as that between protest and voting. We test two hypotheses about this relationship: the hypothesis that protesting and voting are a zero-sum game, one excluding the other, and the hypothesis that they are complementary, mutually reinforcing each other. The aim is to address questions pertaining to the linkages between different types of institutional and extra-institutional forms of activism in Western Europe and follow the calls for studies analyzing the links between parties and protest. We also look at differences across countries, issues, and types of demonstrators.