Varkk:
There is no one with a 'D' after their name that they would accept. They could stand up a decorated war veteran with a spotless record who volunteers at their church and they would still call them satan incarnate and vote for Trump.
That may be true of the rabid Trump supporters, but not of the more moderate Republicans or undecided voters. If the Democrats can increase voter turnout, the Republicans have no chance of fairly* winning in 2020.
Everybody has now seen that Trump's campaigning was not just pre-election rhetoric, with the belief that he would settle into the job if elected. He has demonstrated that he is unquestionably unfit to lead. Putting aside policy differences, numerous bigotries, or sheer incompetence for one moment, he is continuously actively seeking to divide the voting public. This is an attribute that no nation should have in their leader.
*But the chances of it being a fair fight appear to be getting slimmer by the day.