“[...] and in many cases, had their candidate personally trashed by him.”
Politics is a full contact sport. If you cannot compete nor take the heat, get out, stay on the sidelines, and stop complaining.
And, don’t forget: the “trashing” went both ways.
Has nothing to do with “taking the heat”. Trump has to EARN votes/donations/support from the 60% of the republicans who DID NOT vote for him or he gets crushed by the beast. Wake up.