There is NO WAY Trump will win WI & PA against even a semi-competent Democratic candidate.
That's what most thought in 2016. But both those states are getting older, poorer, and less educated--i.e. more Republican. Hillary poured more resources into Pennsylvania than almost any other state and still lost decisively. Last year in a massive anti-Trump wave, Dems only squeaked out the barest of majorities in Wisconsin's state-wide races. Democrats will have an even harder time there when there's an actual name at the top of their ticket for Wisconsin voters to choose between. Right now, polling looks good for Democrats, but a contested election will depress those number significantly.