Great piece by the NYTimes, despite being based on polling that is a bit more Trump-friendly than most of the numbers I've seen publicly and privately.
Key findings:
1) Joe Biden has no special strength with white voters without a college degree.
2) Elizabeth Warren’s problem isn’t the white working class.
3) There is not much difference between a strategy based on turnout and persuasion.
4) The president can keep pace in a higher-turnout election.
5) The Sun Belt opportunity is real, but it is hard to see it as a safe choice.