The most successful policies not only solve problems-they also build supportive co-alitions. Yet, sometimes, policies trigger backlash and mobilize opposition. Although backlash is not a new phenomenon, today's political landscape is distinguished by the frequency and pervasiveness of backlash in nearly every area of US policymaking, from abortion rights to the Affordable Care Act. In Countermobilization, Eric M. Patashnik examines the causes and significance of backlash, drawing on case studies of issues from immigration and trade to heath care and gun control. Patashnik argues that the explosion of backlash politics in recent years has been fueled by partisan polarization, cultural shifts, and negative reactions to policy threats. Examining the features that make policies most vulnerable, Countermobilization also offers practical lessons to help identify and navigate backlash risks.