The ones who are not "true believers" but voted for him because of white guilt and because they actually believed his BS, will not change their minds quickly for the most part, because if they admit he is a liar, a socialist, communist SOB, then they will have to admit they made a mistake. People hate admitting they are wrong.
What we will see is a gradual building up of rage and soon most people won't admit voting for him, that way they can get out of admitting they screwed up!
I have a friend who works in a place (in Portland, Oregon) where all but her are slobbering BO lovers. Or maybe I should say “were”. Some are now having second thoughts.
They should have started smelling a rat when his inauguration speech - which they fervently watched expecting the next world shaking turn of phrase, was so cliche ridden and uninspiring.