This special issue brings together a large variety of contributions dealing with partychoice, political attitudes and the dynamics of electoral campaigns in Switzerland. Theintroduction places the contributions in the broader framework of current debates in theinternational literature and highlights substantial and methodological innovations. The articles inthis volume address central issues of the literature dealing with the two-dimensional structure ofpolitical competition, take up key questions of the dynamics of election campaigns, and finallyecho a large interest for the topic of populism, not only on the side of the parties but also on theside of the voters. The introduction also underlines the new and innovative ways in which thearticles link the different datasets together in order to address substantial questions on thecomplexity of the environment in which voters form their choice and political parties operateduring an election campaign.