Party polarization in Congress
1.Party polarization in the U.S. Congress --2.A brief history of party polarization --3.Explanations for party polarization --4.Redistricting --5.The political and geographic sorting of constituents --6.Extremism of party activists --7.Connecting constituency change to institutional change --8.The interaction in the legislative process --9.The link between the House and the Senate --10.Procedural polarization in the U.S. Congress.