Are congressional leaders middlepersons or extremists? Yes

Abstract

Infuential theories of legislative organization predict that congressional leaders will be selected from the center of their parties. Yet previous research has generally rejected the "middleperson hypothesis," finding leaders to be extremists. We challenged these findings by testing more-appropriate null hypotheses via Monte Carlo simulation. We found that congressional leaders (and leadership candidates as a whole) tend to be closer to their party's median than would occur by chance, but leaders also tend to be selected from the left of the median for Democrats and to the right for Republicans. Compared to the pool of announced candidates for leadership positions, winners are not ideologically distinctive. This result suggests that factors affecting the ideology of leaders tend to operate more at the candidate emergence stage. © 2010 Comparative Legislative Research Center at the University of Iowa.