In an analysis at FiveThirtyEight, Dave Wasserman looked at “landslide counties”—counties where the winning presidential candidate got at least 60 percent of the vote. In 1992, 39 percent of voters lived in landslide counties. By 2016, that had shot to 61 percent of voters. The numbers were even starker when Wasserman looked at counties where the winning candidate won by more than 50 points: the share of voters living in those “extreme landslide” counties more than quintupled, from 4 percent in 1992 to 21 percent in 2016. In less than twenty-five years, the percentage of voters who lived in a
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