The 2010 campaign and election was pivotal: the Republican takeover of the House, the advent of "super PACs," and record-breaking sums spent on a midterm election. More than ever before, interest groups were able to mobilize new resources and new technologies in a shifting set of House and Senate races. This timely volume explores--in a series of lively case studies--a cross-section of groups, communities, and networks that vividly illustrates the "unleashing" of interest group activity in the electoral process in response to Citizens United and other court cases and events.