College students are young, have little or no history of voting, and are residentially mobile, which makes them a population in great need of registering to vote. Universities have a civic, pedagogical, and legal obligation to register their students to vote. In 2006, we conducted a controlled experiment across 16 college campuses to test the efficacy of classroom presentations to increase voter registration. The 25,256 students across more than 1,026 classrooms were randomly assigned to one of three conditions: (1) a control group receiving no presentation; (2) a presentation by a professor; and (3) a presentation by a student volunteer. Verifying registration and voter turnout from a national voter database, we found that both types of presentations increased overall registration by 6 percentage points and turnout rates by approximately 2.6 percentage points. These results demonstrated that universities can take simple steps to engage their students in politics.