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For two decades, extending from the early 1970s to the early 1990s, elections to the U.S. House of Representatives were highly predictable. More than 90 percent of incumbents would seek reelection and more than 90 percent of those incumbents would win--by larger vote margins than in earlier decades. The once-dependable presidential coattail effect diminished, as one-quarter to one-third of all voters split their tickets, supporting presidential and House candidates of different parties. These trends helped the Democrats retain control of the House even while Republican presidential candidates...