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Three essays on changing constituencies and rising polarization in the Congress. The first empirically examines the so-called "Big Sort hypothesis" — the notion that in recent years, liberal and conservative Americans have become increasingly spatially isolated from one another. The second addresses two questions: First, whether over the last 40 years the spatial distribution of the American electorate has become more geographically clustered with respect to party voting and socioeconomic attributes, and second whether this sorting process has contributed to rising polarization in the US House of Representatives. The third considers gridlock itself as a problem to be solved and addresses the question of how it might be lessened.