This paper addresses the problem of isolating and measuring the influence of hatred on political behavior by analyzing a nationwide panel study conducted during the 2006 election campaign in Israel. We argue that collective hatred is composed of 2 distinct emotional aspects: chronic and immediate. The core of this paper is an analysis of the influence of these 2 types of group-based hatred on 3 aspects of political behavior: political learning, party identification stability, and partisan support. The results indicate that both aspects of collective hatred—chronic and immediate—are incongruously crucial for the understanding of political outcomes, particularly political learning. We discuss the broader implications of these findings in assessing the impact of group-based hatred on the political process.