Constituent Influence on International Trade Policy in the United States, 1987–2006

The debate on whether class-based or industry-based coalitions are politically salient in American trade politics has illuminated domestic sources of international trade policy but remains unresolved. In particular, the literature offers contradictory evidence on the dominance in recent years of class-based or industry-based trade politics. This contradiction is mainly due to selective use of congressional votes. This article contributes to this debate by applying a multilevel item-response-theory model to the entire universe of trade-related votes since 1987. This study finds that class-based coalitions are politically salient in current U.S. trade politics. Furthermore, while this study confirms the significance of party influence on trade voting, it finds little support for the view that political parties have dyadic relationships with particular groups of constituents.