In Search of Killer Amendments In the Modern U.S. House

Numerous studies have examined the incidence of killer amendments in Congress, but most of these studies have been either case specific, focusing on the legislative maneuverings around a single issue or bill, or temporally limited, focusing on strategic activity in only one or two Congresses. In this article, we present the beginning of a comprehensive research agenda for the systematic study of killer amendments. Using roll‐call data from the 83d through the 108th U.S. House (1953–2004), we identified those bills that (a) were successfully amended and (b) subsequently went down to defeat, a necessary condition for the existence of a killer amendment. We then examined these cases in greater detail, using both spatial analyses and case studies. Our analysis uncovered five cases, four of which are new, that appear to have the characteristics of true killer amendments, thus setting the stage for future analyses across time and legislative chambers and bodies.