I am an Associate Professor of Political Science at the University of Copenhagen and Center for Social Data Science. I am also a faculty research affiliate at the Center for Social Media and Politics at NYU. I research political behavior, social media, and quantitative methods.

Research

Gendered Perceptions and the Costs of Political Toxicity: Experimental Evidence from Politicians and Citizens in Four Democracies
American Political Science Review. Forthcoming.
(with Anne Rasmussen)

News Sharing on Social Media: Mapping the Ideology of News Media, Politicians, and the Mass Public
Political Analysis. Forthcoming.
(with Richard Bonneau, Joshua Tucker & Jonathan Nagler)
Statistical software; Software instructions
Data: Ideology scores for news organizations (e.g. nytimes.com, foxnews.com)
Data: Ideology scores of members of Congress (116th Congress)

The Unequal Effects of the COVID-19 Pandemic on Political Interest Representation
Political Behavior. 2024, 46 (1).
(with Anne Rasmussen)

Do Violent Protests Affect Expressions of Party Identity? Evidence from the Capitol Insurrection
American Political Science Review. 2023, 117 (3).
(with Frederik Hjorth & Peter Thisted Dinesen)

Exposure to the Russian Internet Research Agency Foreign Influence Campaign on Twitter in the 2016 US Election and its Relationship to Attitudes and Voting Behavior
Nature Communications. 2023, 14 (62).
(with Tom Paskhalis, Jan Zilinsky, Richard Bonneau, Jonathan Nagler & Joshua Tucker)

Does International Terrorism affect Public Attitudes toward Refugees? Evidence from a Large-scale Natural Experiment
Journal of Politics. 2022, 84 (1).
(with Charles Breton)

Measuring Uncertainty about Candidate Ideology: An Application to US Presidential Elections
Journal of Politics. 2021, 83 (2).
(with Peter Loewen)

Cross-Platform State Propaganda: Russian Trolls on Twitter and YouTube during the 2016 US Presidential Election
International Journal of Press/Politics. 2020, 25 (3).
(with Yevgeniy Golovchenko, Cody Buntain, Megan Brown & Joshua Tucker)

Presidential Greatness in a Polarized Era: Results from the Latest Presidential Greatness Survey
PS: Political Science & Politics. 2020, 53 (3).
(with Brandon Rottinghaus & Justin S. Vaughn)

How Many People Live in Political Bubbles on Social Media? Evidence from Linked Survey and Twitter Data.
SAGE Open. 2019, 9 (1).
(with Jonathan Nagler, Andrew Guess, Joshua Tucker & Jan Zilinsky)

Statistical Analysis of Misreporting on Sensitive Survey Questions.
Political Analysis. 2017, 25 (2).
Statistical software; Software instructions

Statistical software

mediascores: News-sharing Ideology from Social Media Link Data
This statistical software uses data from the links shared by social media users to news media stories to jointly estimate the ideology of those users and the media organizations they share links to (e.g. nytimes.com, foxnews.com). It accompanies the article "News Sharing on Social Media: Mapping the Ideology of News Media, Politicians, and the Mass Public" (Politician Analysis, Forthcoming).
Software instructions; Academic article

misreport: Statistical Analysis of Misreporting on Sensitive Survey Questions
This statistical software allows researchers to investigate who misreports sensitive attitudes (e.g. racist or sexist beliefs) or behaviors by jointly modeling survey responses to a list experiment and direct question about that attitude or behavior. It accompanies the article "Statistical Analysis of Misreporting on Sensitive Survey Questions" (Political Analysis, 2017).
Software instructions; Academic article

Vox Pop Labs

I was a partner at, and currently am an advisor for Vox Pop Labs, a political engagement and public opinion research firm that brings social science to the public through civic education applications. Our partners include Vox.com, the Wall Street Journal, Sky News (UK), the Canadian Broadcasting Corporation (CBC), RTL (Germany), France 24, the Australian Broadcasting Corporation (ABC), and TV New Zealand. Vox Pop Labs' most popular application, Vote Compass, has been used by tens of millions of voters, providing them with information about the positions of the political parties on a wide array of issues.

Recent public writing

International terrorism decreases public support for refugee resettlement, but not for long
Journal of Politics Blog. January 22, 2022.
(with Charles Breton)

The Jan. 6 riot at the Capitol hurt the Republican Party, new research finds
Washington Post. July 16, 2021.
(with Frederik Hjorth & Peter Thisted Dinesen)

Trying to understand Jeff Flake? We analyzed his Twitter feed — and were surprised
Washington Post. October 5, 2018.
(with Jan Zilinsky, Jonathan Nagler & Joshua Tucker)
Methodological supplement

Comparing Trump to the greatest—and the most polarizing—presidents in US history
Brookings. March 20, 2018.
(with Brandon Rottinghaus & Justin S. Vaughn)