Public opinion polls have become increasingly prominent during elections, but how they affect voting behaviour remains uncertain. In this work, we estimate the effects of poll exposure using an experimental design in which we randomly assign the availability of polls to participants in simulated election campaigns. We draw upon results from ten independent experiments conducted across six countries on four continents (Argentina, Australia, Canada, New Zealand, the United Kingdom, and the United States) to examine how polls affect the amount of information individuals seek and the votes that they cast. We further assess how poll effects differ according to individual-level factors, such as partisanship and political sophistication, and the content included in polls and how it is presented. Our work provides a comprehensive assessment of the power of polls and the implications for poll reporting in contemporary elections.

Three unprecedented large-scale democratic experiments have recently taken place. Citizen assemblies on electoral reform were conducted in British Columbia, the Netherlands, and Ontario. Groups of randomly selected ordinary citizens were asked to independently design the next electoral system. In each case, the participants spent almost an entire year learning about electoral systems, consulting the public, deliberating, debating, and ultimately deciding what specific institution should be adopted. When Citizens Decide uses these unique cases to examine claims about citizens' capacity for democratic deliberation and active engagement in policy-making. It offers empirical insight into numerous debates and provides answers to a series of key questions: 1) Are ordinary citizens able to decide about a complex issue? Are their decisions reasonable? 2) Who takes part in such proceedings? Are they dominated by people dissatisfied by the status quo? 3) Do some citizens play a more prominent role than others? Are decisions driven by the most vocal or most informed members? 4) Did the participants decide by themselves? Were they influenced by staff, political parties, interest groups, or the public hearings? 5) Does participation in a deliberative process foster citizenship? Did participants become more trusting, tolerant, open-minded, civic-minded, interested in politics, and active in politics? 6) How do the other political actors react? Can the electorate accept policy proposals made by a group of ordinary citizens? The analyses rely upon various types of evidence about both the inner workings of the assemblies and the reactions toward them outside: multi-wave panel surveys of assembly members, content analysis of newspaper coverage, and public opinion survey data. The lessons drawn from this research are relevant to those interested in political participation, public opinion, deliberation, public policy, and democracy. Comparative Politics is a series for students, teachers, and researchers of political science that deals with contemporary government and politics. Global in scope, books in the series are characterised by a stress on comparative analysis and strong methodological rigour. The series is published in association with the European Consortium for Political Research. For more information visit: www.essex.ac.uk/ecpr. The Comparative Politics Series is edited by Professor David M. Farrell, School of Politics and International Relations, University College Dublin, Kenneth Carty, Professor of Political Science, University of British Columbia, and Professor Dirk Berg-Schlosser, Institute of Political Science, Philipps University, Marburg.