With Donald J. Trump rapidly closing in on the Republican presidential nomination, the 2024 general election campaign is set to be one of the longest in modern history, pushing President Biden and Mr. Trump into unfamiliar territory as they struggle to engage an electorate that seems numbed by the prospect of a 2020 rematch.

For all their experience in presidential politics, Mr. Biden and Mr. Trump face extraordinarily complicated challenges as they and their aides grapple with how to run a…


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