Casualties and Incumbents: Do the Casualties from Interstate Conflicts Affect Incumbent Party Vote Share?

Research suggests that the costs of international conflict (e.g. casualties) alter public opinion, executive approval and policy positions of elected officials. However, do casualties affect voting in terms of aggregate outcomes and individual vote choices? This article examines how casualties from interstate conflicts affect voter behaviour, specifically incumbent vote share. Using the investment model of commitment to model individual vote choice, it is argued that increases in the costs of conflict (i.e., more casualties) can increase the probability that voters will support the incumbent, increasing incumbent vote share. This model is tested with both cross-national aggregate data from twenty-three countries and individual-level British survey data. The results support the argument.