We analyze affiliation networks of interest groups that endorse the same candidates in primary elections, donate to the same candidates in general elections, and voice support for the same legislative proposals. Patterns of interest group ties resemble two competing party coalitions in elections but not in legislative debate. Campaign endorsement and financial contribution ties among interest groups are consistently correlated but legislative ties do not follow directly from electoral alliances. The results challenge the consensus in the emerging literature on the expanded party organization; interest groups have distinct incentives to join together in a party coalition in elections but also to build bipartisan grand coalitions to pursue legislative goals. We also modify conventional views on party differences. The Democratic coalition is not fractured into many small constituencies. The Democratic campaign and legislative networks are denser than equivalent Republican networks, with a core of labor organizations occupying central positions.
Research suggests that endorsements should affect outcomes in low-information elections such as primaries, but that hypothesis has not yet been tested empirically. Based on a survey of 2002 congressional campaigns, this article describes the universe of individuals and groups that offer endorsements to primary candidates and analyzes their effects on primary election results. It finds that a primary candidate’s share of the partisan endorsements issued in the race significantly affects the candidate’s vote share, even controlling for campaign funds and candidate quality. Implications for theories of candidate emergence and success are discussed.
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