I wonder why no one has mentioned that "Trump won Wisconsin with fewer votes than Romney" (or some variation of that like "Trump won PA and MI, but Clinton lost WI"). It’s usually such a popular (absurdly simplistic) talking point to explain away obvious trends/shifts in the state's voting patterns which favor Republicans and fly in the face of the theory that 2016 was a "fluke."
Exit polls showed more Trump voters in Wisconsin who thought that he was unfit and unqualified for the job than any other state. The easiest interpretation of this is that they hated Clinton more. Today we continue to see Trump way underwater on approvals, but the actual election polls tight. This demands some sort of explanation. I can throw a few out there:
1. For many voters in WI the Trump ideology is attractive even if Trump is repulsive, and they're willing to put up with keeping him in office in the hope that we'll make China play fair on trade and continue the economic growth of the past 10 years.
2. These voters simply hate Democrats, and aren't willing to vote for one (for president, at least) under any circumstances.
3. Gary Johnson voters are coming home.
I don't know. It belies explanation. Either the approvals are wonky, or the election polling is wonky.