HARRISBURG, Pennsylvania — Vice President Kamala Harris and former President Donald Trump only have one month left to win over voters.

Four weeks before Election Day, Harris and Trump are locked in a margin-of-error contest nationally and in the seven battleground states, with every vote mattering between now and until ballots can no longer be cast. But in a political environment where many traditional fundamentals no longer apply, they have work to do to turn out their respective bases and persuade any undecided voters.

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