Mr. Rubinstein:  I think the answer is "cognitive dissonance".....the extreme discomfort of holding two incompatable thoughts at the same time.  If you're a dedicated Trump supporter, the massive, and ever-growing, records of Mr. Trump's prevarications cannot exist alongside the belief that he should be our next President.  One of the two must be discarded and continuing Trump supporters must reject the evidence of Mr. Trump's lies, his ignornace of matters important to the office of the President, and his demonstrated lack of simple decency as he interacts with others.  

GOP leaders, including many "down-ballot" candidates are solving that "cognitive dissonance" dilemma by taking the other tact.....they are distancing themselves from Trump and some have begun withdrawing their endorsement of his candidacy.  Over the next three months, I think more and more 
Americans will do the same thing.  It's difficult to continue to support a candidate engaging in sociopathic behaviors.