I don’t think you understand how deep the #nevertrump feelings run. Or how RINO the mainstream Republican party can be. And how much the Wall Street Journal contingent wants the same open borders Hillary wants. I don’t see a big grass-roots movement for Republicans to vote against Trump, but a significant portion of these avid policy wonk and political junkie type of Republicans will vote against him.
It is deep but there are not many.
I know the visible GOPe leaders who are NeverTrump are vocal about their opposition. But the NeverTrump crowd is a very small minority, and they will probably stay home rather than go out of their way to vote. I look at the percentage of Republicans backing Trump. It’s over 80% now, and will get close to 90% by November 8.
Remember, it’s not the percentage of Republicans that favor the candidate, but how many of them turn out to vote. Many conservative Republicans stayed home in 2012, either due to weak support for Romney, or feeling that Obama had it locked.
Countering that less than optimum Republican support is the large union vote that sees Clinton as hurting their jobs with regulations, slow economy and high levels of immigration. They will file a protest vote against the Democratic ticket.