I think his base adores dumb don because he is so much dumber than they are. He does things they'd never do/say and so?

Well obviously they KNOW they're way smarter than him. They can look down on him and love him just because he is so stupid dumb. Like a mentally defective favorite child! That's the secret to his success. Being so much dumber than everyone else! Good for their egos don'tcha know?