Linking Citizens to Government: Interest Group Politics at Common CauseLawrence Rothenberg examines some of the most elusive aspects of interest group operations through an in depth study of one of the largest interest groups in Washington, Common Cause. In developing what might be called a membership theory, he asks such questions as: Why do members join a group? Who stays and who leaves and why? What is the nature of the relationships among the activists, the group leaders and the rank and file members? How do these