While past research has offered some initial evidence linking patterns of position-taking behavior with incumbents' electoral fortunes, we are left without a comprehensive study that informs us whether individual roll-call votes can be electorally consequential and lends insight into the conditions under which position-taking on roll calls may yield electoral implications. This article takes a step toward filling that void by examining the electoral implications of hundreds of House roll calls since the early 1970s. We find that, after controlling for the usual factors, a wide range of individual roll-call decisions have significant effects on incumbents' electoral margins. We also find that the extent to which a particular roll call is controversial, salient, and a catalyst for intra-party disagreement affects whether it has electoral implications. In sum, our analysis addresses long-standing questions regarding how and when legislators are rewarded or punished at the polls for their behavior in Congress.