Even if you ignored him routinely acting like a giant twat, it's still hard to see how anyone can still support him. His biggest accomplishments so far are exploding the deficit, starting a trade war with the entire world, and pissing on America's allies.
They're going to need some state-sactioned massive re-programming centres in the US after he's gone just to get rid of all the brainwashing it took to get him a 40% approval rating.