As online and mobile information technologies continue to become more commonplace, Americans are increasingly turning to these sources for news. Online news sites often allow readers to post comments about news stories. Using an experiment, the authors of this study sought to understand how user comments influence individual perceptions of media bias and third person perception in online political news. Results indicate that user comments accompanying online content can influence perceptions of bias in media depictions of presidential candidates. Additionally, user comments can influence perceptions of how much online news affects the political attitudes of others (third-person perception).