Across the six closest states that went Republican in 2016, he trails Joe Biden by an average of two points among registered voters but stays within the margin of error.

Mr. Trump leads Elizabeth Warren by two points among registered voters, the same margin as his win over Hillary Clinton in these states three years ago…

The poll offers little evidence that any Democrat, including Mr. Biden, has made substantial progress toward winning back the white working-class voters who defected to the president in 2016, at least so far. All the leading Democratic candidates trail in the precincts or counties that voted for Barack Obama and then flipped to Mr. Trump.

As a result, Democrats appear to have made little progress in reclaiming their traditional advantage in the Northern battleground states, despite their sweep there in the 2018 midterms. Respondents in these states said they voted for Democratic congressional candidates by an average of six points, all but identical to their actual winning margins.