Why do people participate in politics? What are the differences across different forms of political participation? Under what circumstances are individuals persuaded to adopt some new position? Why do people vote the way they do? How do local conditions affect vote choice in national elections? Do political campaigns matter? What is the nature of leadership? What explains trust, trustworthiness and prosocial behaviour such as altruism and reciprocity? How do institutions and culture interact? How do people think about ethnic (and other) diversity and what effect does it have on how they behave? Can we come up with better ways of measuring different forms of social and political diversity? What determines how representation and accountability work in electoral democracies? When do elected representatives behave like delegates and when do they act like trustees?