In this article, we model the effect of foreign policy attitudes on both vote choice and casualty tolerance, using survey data collected during the 2004 election. We show that prospective judgments of the likelihood of success in Iraq and retrospective judgments of whether the war in Iraq was right are significant determinants of both vote choice and casualty tolerance. The prospective judgment of success is key in predicting casualty tolerance, while retrospective judgment of whether the war was right takes precedence in determining vote choice. In addition, there is an important interaction between the two variables, so the effect of one is conditional on the value of the other. We believe this is compelling evidence that foreign policy matters, and that it matters in reasonable ways.