Are Twamp supporters really that stupid?

Yes they are. 96% of them would vote for him again, despite all Twamp has done to harm them and the rest of us. Only 2% regret that choice. One reason is that Twamp continues to ramp up the hateful rhetoric against those dark others. Plus many of that ilk get fed misinformation and fake news constantly by Twamp and the right-wing spin machine. And as many others have noted, many of them are suckers for strong auhoritarinan leaders. Not too worry, Clinton supporters fared a little better but not by much. Bottom line: Many Americans are idiots, so no sense in sugar coating it or being politically correct.