This research examined the influence of attention to specific forms of traditional and online media on young adults’ online and offline political participation as well as voter turnout during the fall 2012 presidential campaign. A three-wave panel survey demonstrated that attention to traditional media did not increase offline and online political participation in September; instead, participation was heightened by attention to online sources, particularly presidential candidate websites, Facebook, Twitter, and blogs. In the following months, individual-level change in participation was attributable to attention to several online media sources as well as change in media attention. In the case of voter turnout, results suggest that television attention was positively linked to voter likelihood in September but was negatively linked to individual-level change in voter turnout in November.