00383pab a2200121 454500008004000000100002200040245011900062260000900181300001500190362000800205650001400213773003400227180718b2009   xxu||||| |||| 00| 0 eng d  aButter, Daniel M.  aThe effect of the size of voting blocs of incumbents' roll-call voting and the asymmetric polarization of Congress  c2009  ap.297-318.  aAug  aElections  aLegislative Studies Quarterly