Research
Media influence and political extremism
When do powerful media outlets change public opinion, and how should journalists cover extreme political actors? Using the 30-year boycott of The Sun in Merseyside after the Hillsborough disaster, Daniel Bischof and I show that the boycott made attitudes towards the EU more positive. With Diane Bolet, I show that uncritical interviews with extreme right activists increase agreement with extreme right views and the perception that these views are widely shared, and that critical interviewing mitigates, but does not reverse, these normalisation effects.
- “Tabloid Media Campaigns and Public Opinion” (with Daniel Bischof), American Political Science Review 2022
- “Media Platforming and the Normalisation of Extreme Right Views” (with Diane Bolet), British Journal of Political Science 2025
Election campaigns, voter mobilization and turnout inequality
Do campaigns mobilize voters, whom do they mobilize, and do they make the electorate more or less unequal? My field experiments with political parties show that partisan campaigns change the composition of the electorate, that partisan cues affect mobilization, and that appeals invoking negative political identities mobilize costly political action such as donations. With Peter John, Francisco Tomás-Valiente and Asli Ceren Cinar, I am completing a book that meta-analyses more than 370 voter mobilization experiments.
- “Parties Are No Civic Charities” (with Peter John), Political Science Research and Methods 2018
- “The Role of Partisan Cues in Voter Mobilization Campaigns” (with Eline de Rooij), Electoral Studies 2017
- “Do Text Messages Increase Voter Registration?” (with Vanessa Cheng-Matsuno, Peter John and Asli Unan), Electoral Studies 2023
- “Null Effects of Social Media Ads on Voter Registration: Three Digital Field Experiments” (with Asli Unan, Peter John and Vanessa Cheng-Matsuno), Research & Politics 2024
- “Negative Political Identities and Costly Political Action” (with Katharina Lawall, Stuart Turnbull-Dugarte and Joshua Townsley), Journal of Politics 2025
- Mobilization across Time and Space (book project, with Peter John, Francisco Tomás-Valiente and Asli Ceren Cinar)
Social networks and political influence
How do campaign effects spread from the people who are contacted to their partners, families and neighbours? Exploiting experimental spillovers, I show that household members influence each other’s turnout, particularly in politically mixed households, and that neighbourhood partisan context conditions social mobilization.
- “All in the Family? Partisan Disagreement and Electoral Mobilization in Intimate Networks” (with Eline de Rooij), American Journal of Political Science 2017
- “Social Mobilization in Partisan Spaces” (with Peter John, Christian Mueller and Kevin Cunningham), Journal of Politics 2021
- “Does Social Media Promote Civic Activism?” (with Lyubomir Kostadinov, Nikolay Marinov and Frank Schimmelfennig), Political Science Research and Methods 2020
Political persuasion and support for democracy
Can politicians persuade citizens, and can they bolster support for liberal democracy? Drawing on randomized field experiments with a Labour parliamentary candidate, I show that introduction letters and personal meetings with the candidate shifted voting intentions, with effects that persisted for up to six months but decayed over time. With Alexander Wuttke, I show that politicians who actively make the case for democracy in town-hall settings increase citizens’ support for democracy, while one-way speeches do not.
- “The Parliamentary Candidate as Persuader: Evidence from Randomized Candidate–Voter Interactions”, working paper
- “Making the Case for Democracy: A Field Experiment on Democratic Persuasion” (with Alexander Wuttke), European Journal of Political Research 2025
- “Null Effects of Pro-Democracy Speeches by U.S. Republicans in the Aftermath of January 6th” (with Alexander Wuttke and Florian Sichart), Journal of Experimental Political Science 2024
AI and democracy
How is artificial intelligence changing election campaigns and democratic politics? I study how election campaigns use AI and, with Bailey Flanigan, Archon Fung and Charles Stewart III, which democratic functions in campaigns, election administration, social movements and deliberation AI can substitute for, augment or leave unchanged. I am a member of the APSA Presidential Task Force on AI, Politics, and Political Science.
- “The Use of AI by Election Campaigns”, LSE Public Policy Review 2024
- “Artificial Intelligence and Democracy: Campaigns, Elections, Movements, and Deliberation” (with Bailey Flanigan, Archon Fung and Charles Stewart III), in Artificial Intelligence, Politics, and Political Science, Cambridge University Press, forthcoming
Gender and political recruitment
Can female role models increase young women’s political ambition? In a field experiment with female legislators, Fabrizio Gilardi and I find that meeting politicians raised young women’s political interest but not their ambition to run for office. A follow-up experiment with Julia Gillard shows that narratives of overcoming gendered barriers can increase young women’s political efficacy.
- “Can Role Models Increase Women’s Political Ambition? A Field Experiment with Politicians” (with Fabrizio Gilardi), Journal of Experimental Political Science 2020
- “Mobilizing Party Activism: A Field Experiment with Party Members and Sympathizers” (with Giordano Neuenschwander), Electoral Studies 2021
- “Women Leaders Can Increase Young Women’s Political Ambition” (with Susannah Hume)
Representation, responsiveness and party competition
How do legislators respond to constituents, and how does multi-level party competition shape national elections? My work includes field experiments with British MPs and studies of the national effects of subnational representation.
- “When Legislators Do Not Differentiate: A Field Experiment on British MPs’ Responses to Constituent Policy Queries” (with Daniel Bischof et al.), British Journal of Political Science 2026
- “The National Effects of Subnational Representation” (with Elias Dinas), Quarterly Journal of Political Science 2017