The undercounted and less-educated remain Trump's best hope

The polls were right in 2016.

Yeah, that's what I said. The national polls predicted the popular vote (which is what polls measure, and by their very nature all they can measure) for the most part accurately, within their margin of error. One reason why they failed to foresee Donald Trump's Electoral College victory (possible because of razor-thin margins in several critical states) was that the pundits paid too little attention to the far more accurate state polls.

But another was under polling less-educated voters. And voters on the political fringes, who assume that the system is rigged and customarily don't vote, aren't polled at all. I remain convinced that it was these fringe voters who, recognizing a kindred spirit in Donald Trump, decided to vote for the first time or at least the first time in a long while that swung the election for Mr. Trump.

Here's an interesting article that suggests that Democrats shouldn't get too cocky about Joe Biden's huge lead over Mr. Trump in the polls right now.  Less-educated voters, it argues, are still being undercounted- and while the problem is unlikely to allow the president to overcome a deficit the size Biden's current lead presents if the race narrows Mr. Trump could score another surprise Electoral College victory in 2020.

I personally don't see it happening. The narrowness of the margin by which Mr. Trump won several states in 2016 seems to me to suggest that it won't survive his current unpopularity in any case. But the article calls attention to an important point: by and large, the less well-informed a voter is, the more likely he or she is to vote for Donald Trump, and there are lots and lots of ill-informed people out there, especially on the fringes. They remain Mr. Trump's last, best hope of pulling off another upset.