Abstract
Legislators are highly sensitive to those parts of their reelection constituencies whose support is least solid. Therefore, out-party members of Congress should be more supportive of the opposing party's president when that president enjoys greater electoral support among the legislators' reelection constituencies. This hypothesis is tested in the U.S. House of Representatives during the 1980s and 1990s. The hypothesis is supported, even with controls for the ideology of the member and the political orientation of the district. The findings suggest legislators have a sophisticated view of their districts and perceive electoral messages from the voting patterns of their constituents. The results also imply that presidential success is conditioned by the forces that operate in the congressional election context.