War heightens public interest in politics, especially when human lives are lost. We examine whether, and how, combat casualties affect the decision to vote in established democracies. Drawing from social psychology research on mortality salience, we expect increasing casualties to increase the salience of death, information that moves people to defend their worldview, especially nationalistic and ideological values. By heightening the importance of values, we propose that combat casualties increase the benefits of voting. In particular, we expect the effect of combat casualties to be pronounced among the least politically engaged. Using both cross-national data of elections in 23 democracies over a 50-year period and survey data from the United States and United Kingdom during the Iraq and Afghanistan wars, we found that mounting casualties increase turnout. Furthermore, as expected, we found the effect of casualties to be most pronounced among those least interested in politics. for helpful comments and suggestions. democracies over a 50-year period. At the individual level of analysis, we examine survey data from the United States and United Kingdom during the Iraq and Afghanistan wars, finding that geographically and temporally proximate casualties increase turnout. Furthermore, we found that casualties increase turnout by reaching the least politically engaged members of society, those who report little interest in politics.The results are relevant to studies of international relations and voter participation, connecting domestic politics and international conflict, especially how mass politics might inform elite decision making. Research in this vein suggests that it is the fear of losing office, or declining public approval, that affects the foreign policies of democratic states (Koch and Sullivan 2010; Palmer, London, and Regan 2004). In both anticipatory representation frameworks (Baum 2004;Sobel 2001) and audience costs frameworks (Fearon 1994), potential shifts in public opinion or the mobilization of new voters is likely to constrain leaders from acting, fearing either a