DescriptionThis study examines whether perceived anger, perceived contempt, and felt contempt, when moderated by partisanship and party identification, affect participants' feelings of favorability towards four 2014 US Senatorial candidates. Data were gathered from respondents in New Jersey and Iowa via two online surveys. Extrapolating from the Emotion System model, this study predicted that the combined effects of partisanship and perceived emotions in political videos would most lower participants’ opinions of the targets of candidates’ videos in two combinations: strong partisanship paired with a contemptuous video, and weak partisanship paired with an angry video. In addition, it was predicted that less partisan participants would react to contempt in videos by evaluating the attacker negatively. Finally, it was predicted that contempt – both observed in a video, and felt by a participant – would reduce target candidate favorability more for Republicans than Democrats. These hypotheses were designed to explore the effects of emotions on political decision-making, and address long-standing questions about the inconsistent effects of negative campaigning. None of the hypotheses were supported, but main effects of partisanship, anger, and contempt were observed among Republicans, suggesting the existence of intra-party factions and reinforcing the need for continued study of discrete emotions in political psychology.