Commentators today frequently describe our national political system as stalemated between two evenly matched parties. Scholars and pundits alike tell us that a major source of America’s democratic ills—for example, polarization and gridlock—is an unusual degree of partisan “parity.” Presidential elections are determined by razor-thin margins; the U.S. Senate is evenly split. But such claims obscure the fact that parity is manufactured by our institutions. Electoral College outcomes are indeed decided by the narrowest of margins, and the two parties’ seat shares in the Senate are closely
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