Candidate status, presidential approval, and voting for US senator

This research tests whether the effects of assessments of presidential performance on the senate voting decision are largest for out-party incumbents and smaller for out-party incumbents and candidates in open-seat contests, a pattern suggested by the restricted in-party culpability thesis. Analysis of data from the 1988–1990–1992 Pooled Senate Election Study reveals that the effects of appraisals of presidential performance are greatest in open-seat contests and those with in-party incumbents, contrary to the restricted in-party culpability thesis. For incumbents of the out-party and candidates in open-seat contests, the effects of assessments of presidential performance are principally a function of the competitiveness of the contest. Assessments of presidential performance shape the voting decision in contests with in-party incumbents regardless of the level of electoral competitiveness.