Preferences,Partisanship, and Whip Activity in the U.S. House of Representatives

Using Democratic whip counts from the 92d House, we compare representatives' stated intentions to their actual roll‐call votes to detect evidence of party pressure. After arguing that this strategy understates real party influence, we nonetheless point to evidence of member conversion by party leaders. On 16 bills analyzed, two‐thirds of the switches between the count and the vote occur in the direction favored by party leaders. We examine one bill in depth, showing how the efforts of party leaders were consequential to the outcome. The pattern of movement on this bill, along with data from the larger set of bills, provides evidence that leaders act strategically, targeting the members whose persuasion requires the fewest resources.