The Conditional Lawmaking Benefits of Party Faction Membership in Congress

Does joining a party faction in Congress enhance or undermine a member’s lawmaking effectiveness? Prior research suggests that factions can help members electorally in signaling their distinct ideological positions to potential political supporters. By contrast, we examine the nine largest ideological caucuses over the past quarter century to test three hypotheses about the conditional lawmaking benefits of faction membership: (1) that benefits from faction membership are limited to those in the minority party; (2) that members of ideologically centrist factions gain the greatest benefits; and (3) that sizable factions exploit their pivotal positions to help their members achieve legislative victories. We find support for only the first of these three conjectures, consistent with the argument that factions offer valuable resources to those in the minority party and that majority-party leaders counter the proposals arising from their own party’s factions. The fact that faction membership offers no significant lawmaking benefit to majority-party legislators challenges conventional wisdom.