From all that I can gather, his base remains approximately the same as always.
Part of that owes to the fact that he's worked hard at accomplishing much of that which he promised to do. In addition, there's the seriousness of the threat to democracy posed by "the resistance" (which Brinny might have had in mind with her post above). Imagine what the country would be like now if the other side had won-or if it gets another chance too soon and does win.
Then too, I believe that if you call the president--on a daily basis--every dirty name in the book, promote the idea of assassinating him, call him a liar, child molester, Nazi, racist, clown, orangehaired liar dictator, misogynist, anti-Semite, Russian stooge, moron, phony Christian, hater of the poor, warmonger, and fan of the New England Patriots...
...none of it has much sticking power after awhile.