The number of true “swing” districts has dropped more than 50 percent compared to 20 years ago, from 164 seats down to just 72 after the 2016 election, said the Cook Political Report. ut of the 92 swing districts that “vanished,” more than 80 percent of them disappeared because voters moved around, in a process demographers call “self-sorting” — not because lawmakers drew themselves safer districts, the analysis said. (AP Photo/J. Scott Applewhite)
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