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When does increasing mobilization effort increase turnout? Recent experiments find second calls containing a reminder to vote increase turnout beyond an initial contact. We argue existing studies cannot explain why reminder calls are effective because they test bundled treatments including a late mobilization attempt, a late mobilization attempt given earlier contact, and potentially activating reciprocity established in earlier contact. We report results from a two-round voter mobilization field experiment that allows us to isolate these different mechanisms. We find that reminder calls increase turnout by 1.2% points among subjects contacted in an earlier attempt, but that enhancing reciprocity by providing a reminder call offer during an early call does not increase turnout beyond a second call. Additionally, we fail to find heterogeneous effects of reminder calls by stated preference for a reminder or by stated vote intention, suggesting certain mechanisms do not explain the effects of reminder calls. [ABSTRACT FROM AUTHOR]

Recent research finds that doubts about the integrity of the secret ballot as an institution persist among the American public. We build on this finding by providing novel field experimental evidence about how information about ballot secrecy protections can increase turnout among registered voters who had not previously voted. First, we show that a private group’s mailing designed to address secrecy concerns modestly increased turnout in the highly contested 2012 Wisconsin gubernatorial recall election. Second, we exploit this and an earlier field experiment conducted in Connecticut during the 2010 congressional midterm election season to identify the persistent effects of such messages from both governmental and non-governmental sources. Together, these results provide new evidence about how message source and campaign context affect efforts to mobilize previous non-voters by addressing secrecy concerns, as well as show that attempting to address these beliefs increases long-term participation. [ABSTRACT FROM PUBLISHER]