His interests are in elections, public opinion and voting behaviour in comparative perspective, with a focus on models of voting behaviour and party competition. A member of the Italian National Election Studies (ITANES) and coordinator of the Italian Center for Electoral Studies at LUISS, he is involved in international research projects such as The True European Voter and EUandI (formerly EU Profiler). Besides his books in Italian, his publications include articles appearing in Comparative Political Studies, West European Politics, South European Society and Politics, Rivista Italiana di Scienza Politica. He has been a research fellow at the University of California – Irvine, the European University Institute and Stanford University.