Mr. Biden's tick upward appears to stem largely from his improved standing among traditional Democratic voters - he is winning a greater share of voters who supported him in 2020 than he did a month ago.
The tightening poll results are the latest evidence of a 2024 contest that both campaigns are preparing to be excruciatingly close, with both candidates holding similar levels of support among past voters.
Most voters think Mr. Biden is too old. A majority believe Mr. Trump has committed serious federal crimes. The share of voters who view the nation as headed in the wrong direction remains a high 64 percent.
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