00341pab a2200109 454500008003600000100001900036245007600055650001700131650003000148700001900178773003400197180718b   xxu||||| |||| 00| 0 eng d  aCanon, David T  aParty system change and political career structure in the U.S. Congress  a Politicians  aPolitical Parties - U.S.A  aSousa, David J  aLegislative Studies Quarterly