Perceiving political engagement to be dangerously low among American citizens, many political science professors in recent years have attempted to promote engagement and ''healthier'' political attitudes. The effectiveness of these efforts appears variable and generally quite modest. Following the model of Canadian citizens' assemblies, we taught a course called Citizens' Assembly on Critical Thinking about the United States (CACTUS) in spring 2008 in which students considered the question: ''Is it time to change the way we elect the President of the United States?'' Because the course employs a form of deliberative democracy CACTUS might be anticipated to encourage engagement. We use a pre-post survey design to measure attitudes of both CACTUS (treatment group) and other (comparison groups) students to examine this. We find that both CACTUS and students enrolled in other political science courses experienced modest growth in their political engagement. More notably, CACTUS students became more extreme in their party identification, ideology, and issue positions and became more supportive of the existing electoral system. We suspect these findings are attributable to the nature and content of CACTUS. Our findings have important implications for future efforts to promote political engagement and for measuring the effects of those efforts. Keywords citizens' assemblies, civic engagement, deliberative democracy, political engagement Masses make noise, citizens deliberate; masses behave, citizens act; masses collide and intersect, citizens engage, share and contribute. At the moment when masses start deliberating, acting, sharing, and contributing, they cease to be masses and become citizens. Only then do they ''participate.'' (Barber 1984, 155) How to transform masses into citizens in an age of declining political engagement is widely discussed by both politicians and political scientists. Among the proposed solutions is deliberative democracy both as means and end: Masses become citizens by learning how to deliberate and practice deliberation as a part of political life. Advocates of deliberative democracy assume that by participating in such