Ohio is most probably not going for Biden, it has slowly been turning red (not Indiana-esque but still similar demographics) with no end in sight (tbf Kasich, DeWine are better than Mike Pence).

Florida is going to be wayyyyy to close to call and it may be that a literal roll of the dice is required (à la 2017 Va. House of Delegates 94th district election)

Wisconsin will most probably see 2018 Ga. gubernatorial election-esque Voter suppression being carried out by the R controlled State Legislature and rubber stamped by the WI Supreme Court which potentially lead to issues in Milwaukee county and Dane County (Madison). The upper middle class snobs who live in suburban Milwaukee (Waukesha, Ozaukee, Washington counties) will vote R no matter what.

North Carolina is too close to call but I hear that Roy Cooper is quite popular maybe that'll result in an up-ballot effect ?