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Accounts of turnout often maintain that citizens participate in elections because the expressive, instrumental and normative benefits associated with the act of voting outweigh the respective costs. Although the impact of those benefits has been empirically assessed in many studies, we know little about when and for whom this impact is stronger. To this end, this paper examines 1) how the effect of those benefits and particularly that of civic duty increases over the election campaign and 2) whether this increase can be attributed to voter heterogeneity. Survey respondents who have not yet decided how they are going to vote will be increasingly swayed to cast a vote on the basis of their civic duty and not other predictors of turnout. The empirical hypotheses are being tested by utilising recent rolling cross-section election studies from Britain. The results suggest that the influence of civic duty on turnout is stable for decided but increases for undecided voters the closer the election day looms.
