Opinion change and voting behaviour in referendums

. Voters in a referendum obtain information and derive voting cues from a variety of sources. Some of these, such as political parties or ideological orientations, are similar to those also found to be influential in elections. Others can be quite different. In some referendums, the issue may be entirely new and unfamiliar to many voters, initiating a ‘learning’ or ‘cue–taking’ process specific to the campaign itself. In referendum campaigns, parties may be internally divided and sometimes send conflicting signals to their electorates. As a result, voting behaviour in referendums often exhibits greater volatility than is found in elections. In the ten papers included in this Special Issue of EJPR , we focus on the process of opinion formation and change which occurred in a number of European, North American and Australia/New Zealand referendums held under a variety of different institutional and political conditions. In this essay, I argue that there are three distinctive patterns of opinion formation and reversal that tend to occur in referendum campaigns, each of which has significant consequences both for voting choice and for referendum outcomes.