Is divided government—a Republican president and a Democratic Congress—the product of diminished competition for seats in the U.S. House of Representatives? In this groundbreaking study, Gary C. Jacobson uses a detailed analysis of the evolution of competition in postwar House elections to argue that the problems Republicans face in seeking House seats are political rather than structural. With abundant graphic illustration, he shows that divided government is only one piece of a much broader electoral pattern that is creating new opportunities as well as new barriers to partisan change...