When Do Partisans Cross the Party Line? George Kwaku Ofosu ∗ November 16, 2020 Abstract Partisans rarely vote for opposition party candidates. In contrast to existing work on cross-party voting in developing countries, I argue that two critical constituency-level factors jointly shape a partisan’s likelihood of voting for a candidate from the other party when desirous of more public infrastructure. The first is partisan geography: partisans have an incentive to vote for a similar or better opposition politician when they live side by side with her supporters in a community (i.e., partisan nonsegregated areas) because politicians cannot exclude them from the provided benefits. Second, voters only have an incentive to cross party lines in competitive electoral districts because their vote can be pivotal in selecting and sanctioning an opposition politician. I find support for my hypothesis and proposed explanation using data from a conjoint experiment alongside survey responses of citizens located in a stratified, representative sample of electoral districts in Ghana. The findings help explain seemingly contradictory results in the literature by showing that partisans are willing to cross party lines in specific electoral settings. ∗Assistant Professor, London School of Economics and Political Science. Email:
[email protected]. Web: www. georgeofosu.com/. Samuel Kweku Yamoah and Mahmouda Ainoo provided excellent field research assistance. I am grateful to Kojo Asante, Sarah Brierley, Adam Harris, Eric Kramon, Galen Murray, Noah Nathan, Franklin Oduro, Daniel Posner, Andrea Vilán, Michael Wahman, Josef Woldense, and Stephane Wolton for their helpful comments and suggestions. I also thank participants of the Midwest Workshop in Empirical Political Science and Comparative Politics Seminars at UCLA, UCL, Oxford’s Nuffield College, and the Institutions and Political Inequality research unit at Wissenschaftszentrum Berlin (WZB) for helpful feedback and suggestions.