Abstract
Electoral systems vary in terms of the choice and influence they offer voters. Beyond selecting between parties, preferential systems allow for choices within parties. More proportional systems make it likely that influence over who determines the assembly’s majority will be distributed across relatively more voters. In response to systems that limit choice and influence, we hypothesize that voters will cast more blank, null, or spoiled ballots on purpose. We use a regression discontinuity opportunity in French municipal elections to test this hypothesis. An exogenously chosen and arbitrary cutpoint is used to determine the electoral rules municipalities use to select their assemblies. We find support for our reasoning—systems that do not allow intraparty preference votes and that lead to disproportional outcomes provoke vote spoilage. Rates of vote spoilage are frequently sufficient to change control over the assembly if those votes had instead been cast validly for the second-place party.
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