Abstract
This paper analyzes the impact of political ideology on the voting behavior of members of Congress. Several recent studies of congressional voting have argued that ideology provides the basis for understanding legislative attitudes on domestic and foreign issues. In order to determine whether and to what extent ideology is the best predictor of roll call behavior, we examine legislators' voting on the fast track–a congressional procedural mechanism–and trade policy. The results show that ideology is an important but not dominant factor in explaining legislators' voting behavior.

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