Essentially if you have the very strong support of 10-15% of the party voters, you’re untouchable.
But then they also vote for him in the general election, since he won, so I conclude he has the support of the Republican base.
Of course that also relies on those “I don’t want Trump” republicans actually voting for him.
But let’s assume that all happens and it’s not the fault of republicans because they are apethetic. How do you explain the congress and senate members who back him?
You don't have to be tapped in to see that whatever is said on Fox becomes Republican dogma very quickly. That's why half the country is more concerned that Zelenskyy is, somehow, a dictator, and less concerned that we ushered Russian state media into our white house.
It's an embarrassing state we're in, but many voters have been fostered with complete incuriosity with what Republican politicians stand for.
If you were evaluating him as a regular person you'd conclude he was demented or otherwise had significant brain damage, and was the no-inhibition combative type that needed to be in a facility. But his word salad apparently appealed to enough people's self-centeredness to end up as President instead. Maybe my happy place can be imagining he's got aphasia, doesn't want any of these harmful policies either, and he's suffering right along with the rest of us.