My thought is he was pushed into this and he was too weak to resist. I can hear them now telling him that Trump will be ruined by the lawfare, maybe in jail even, and he thought there was an open path and his wife must have been pushing him really hard.
His bad judgement/weakness/back stabbing have made him un-Presidential...although those qualities are frequently an asset for most politicians. What he isn’t is shrewd.
He’s done some good things in Florida from what I know - friends who live there are happy.
I agree with all of your comments.
This is Greek strategy stuff—if he could have stayed in FL and done an outstanding job there for a few more years he could have been a future President.
Now he is a laughing-stock—and dare not show his face in Iowa again...