About 40% of the US. It is not his character they are voting for; it is his hatred for the people they perceive as their enemies. (i.e. the greedy violent blacks taking over the government, the liberals who are forcing sex change operations on 2 year olds, the drag queens grooming their kids to be gay.) A large part of this is white backlash, a phenomenon we have seen dozens of times here in the US when black people (or other minorities) gain more rights and are resented for it. Trump capitalized on this backlash in the wake of Obama's presidency. One study described Trump as a "lightning rod for animus" which was a good way to describe it. The study's author said that they discovered "that what he did was serve as a place where people who already held a lot of animus towards marginalized groups, they all sort of gathered around him. So this was a latent faction of Americans that had just - that had already been sitting there and had already existed. It's not necessarily that it's the Republican Party that is creating animus towards people, it's that there's this faction of Americans who really dislike marginalized groups."
As for exusing his various lies, misdeeds and crimes, there's a pattern that has emerged time and time again:
1) He didn't say/do that! It's a liberal media lie!
2) OK maybe he technically said that but what he really meant was X.
3) Obama did it first.
Trump supporters are generally OK with any of those rationalizations.
It's not really an insinuation. About 10 years ago, for example, a study showed that watching FOX News, a right wing news outlet, resulted in people being less informed than if they watched no news at all. It's why COVID death rates are considerably higher in Trump-leaning counties, due to the people there being misinformed about both vaccines and quack cures.
https://www.businessinsider.com/stu...rmed-than-watching-no-news-at-all-2012-5?op=1
https://www.npr.org/2021/07/11/1015120444/study-looks-at-what-motivates-trump-supporters
https://www.usnews.com/news/health-...voted-for-trump-have-higher-covid-death-rates
https://en.wikipedia.org/wiki/White_backlash