To be fair, Joe was never all that bright to begin with. He barely squeaked by in his first election (only 3000 votes more than the incumbent Republican), then pretty much rode incumbent advantage through every election after that. The shift of the Democrats towards supporting corporate interests certainly helped him out in the state with more corporations than people. His previous attempts at presidential runs showed just how much of a moron he was, to the point that the winning strategy this time was to shove him in the basement and not let anyone see him (along with other things like a culpable media running interference and likely a lot of voter fraud too).
Between that and stories like his home improvement disasters, it's to the point that I wonder if he ever actually understood any of the deals going on in his name. Put another way, it would not surprise me to find out that all he did was sign the contract, do whatever it said, and collect a paycheck. I mean, that's basically what he does these days, right? Sign an executive order (or a bill if Congress could ever get one passed), read the teleprompter, and collect his ice cream.
I suppose we should count our blessings that the government is as dysfunctional as it is, despite the myriad crises that are only getting worse. Imagine how much damage they would be doing right now if they could actually get everyone working together.