He is the co-author of The VP Advantage: How Vice Running Mates Influence Home State Voting in Presidential Elections (Manchester University Press), and has published articles on parties, elections, ideology, and the U.S. presidency, in journals including Political Behavior, Political Psychology, Presidential Studies Quarterly, and Electoral Studies. His research has been featured in The New York Times, The Wall Street Journal, and the Los Angeles Times, as well as on NPR and CNN. Also, he has published articles in popular media outlets including the Monkey Cage, FiveThirtyEight, The Conversation, and Politico Magazine.