In 2020, Joe Biden won four states by a margin of less than 2 percent of the vote: Georgia (0.23 percent), Arizona (0.30 percent), Wisconsin (0.63 percent), and Pennsylvania (1.33 percent). Donald Trump won one state, North Carolina, by 1.34 percent.
Biden carried two other key states by margins under three points: Nevada (2.39 percent) and Michigan (2.78 percent).
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