They'll probably be off again, especially in Wisconsin. People calling this "just a Trump phenomenon" are kidding themselves; it's about demographics. The larger the percentage of non-college white voters, the more the polls will underestimate Republicans. It's no coincidence that Colorado, one of the few states where Biden was underestimated, is one of the most educated states in the country.
It’s not JUST a Trump phenomenon, but the errors are certainly largest when Trump is around. It’s the difference between a minor polling error and a major one.
I wasn't saying that the error will always be of the same magnitude; I was just saying that the polling will likely still underestimate Republican support. There are certainly examples of 2018 polls of the Midwest that underestimated Republicans by smaller margins than the 2016 and 2020 polls.
