Even though Democrats won control of the House in 2018, “the lingering effects of partisan gerrymandering, disproportionately by Republican controlled legislatures, make it harder for the Democrats to hold onto control or win control,” said Bernard Grofman, a professor of politics at the University of California, Irvine, “because they have to win probably closer to 52 percent of the national vote, or definitely more than 51 percent.”

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