Here is a nice perspective on the polling data (and why it might be more accurate this year) from the Chicago Tribune:

https://www.chicagotribune.com/election-2020/ct-donald-trump-joe-biden-polls-wisconsin-michigan-20201023-chh2v4ic5zaqpjdhpazlqitowu-story.html

It's encouraging, but I'm not counting out any possibility. The fact that 40% of the people in this country consistently poll as favoring Trump is all I need to know about the overall mental health of the population.