Trading policy: Constituents and party in US trade policy

Studies of US trade policy legislation focus on the effect of constituents on trade policy voting and give less weight to institutions such as political parties. To demonstrate that political parties affect voting, I compare the votes of politicians who share constituency characteristics but differ in political party affiliation. This approach requires less reliance on assumptions about, or empirical measures of, constituents' trade preferences. The results demonstrate that political parties play a significant role in legislative voting on trade policy. Theories of political economy therefore should incorporate how constituency interests and partisan pressures affect legislative voting.