This paper aims at enriching the debate over the measurement of majority party influence in contemporary American legislatures. Our use of a new analytic technique, a grid-search program for characterizing the uncovered set, enables us to begin with a better model of legislative proceedings that abandons the simple one-dimensional spatial models in favor of the more realistic two-dimensional version. Our conclusions are based on the analysis of real-world data rather than on arguments about the relative merits of different theoretic assumptions. Our analysis confirms that when legislators' preferences are polarized, outcomes will generally be closer to the majority party's wishes, even if the majority-party leadership does nothing to influence the legislative process. This conclusion notwithstanding, our analysis also shows that at the margin of the majority party's natural advantage, agenda setting by the majority party remains a viable and efficacious strategy.
The uncovered set and indifference in spatial models: A fuzzy set approach
