You may have hit upon something. The GOP consultants have proved themselves to be stupid, again and again, as you have noted.
May be that is why Trump has success in all polls. He ignores the consultants.
I don’t think they’re stupid. You just have to look at Nicole Wallace who’s become a public one. They are extremely liberal and the candidates who they want to win have been winning, the more liberal candidates. D.C. is a liberal cesspool and they are part of that culture. They are there to help liberal Democrats win and try to turn the Republicans into liberals.