Start with education. One of Trump’s key strengths among voters has been his support among blue-collar workers without a college degree. In 2016, he lost college graduates by about 9 points, but won voters without a degree by about 8 points. There was an “education gap” in the results, but Trump gained as much as he lost in it.

But this week’s poll finds him leading among those without a degree by only about 3 points, while he is losing voters with a degree by 24 points. That’s a massive edge for Biden among voters with a degree and a much smaller edge for Trump among voters that are a big part of his base…

But the most problematic number in the poll for Trump may be his standing with white voters in the head-to-head with Biden. In 2016, Trump won white, non-Hispanic voters by 21 points. It made up for the huge losses he faced with communities of color.

In the new poll, Trump does better with African American and Hispanic voters than he did in 2016, though he still isn’t close to winning those groups. But his edge with white voters is down to just 6 points — 49 percent to 43 percent for Biden — and white voters still make up the overwhelming majority of the electorate.