https://fivethirtyeight.com/features/its-way-too-soon-to-count-trump-out/

«Nor has it been that uncommon, historically, for polls to shift fairly radically from mid-August until Election Day. Furthermore, there are some reasons to think the election will tighten, and President Trump is likely to have an advantage in a close election because of the Electoral College.

That, in a nutshell, is why the FiveThirtyEight presidential election forecast, which we launched today, still has Trump with a 29 percent chance of winning the Electoral College, despite his current deficit in the polls. This is considerably higher than some other forecasts, which put Trump’s chances at around 10 percent. ….

If these numbers give you a sense of deja vu, it may be because they’re very similar to our final forecast in 2016 … when Trump also had a 29 percent chance of winning! (And Hillary Clinton had a 71 percent chance.) So if you’re not taking a 29 percent chance as a serious possibility, I’m not sure there’s much we can say at this point, although there’s a Zoom poker game that I’d be happy to invite you to.»