What I am seeing is that the GOP have acted like rank cowards for much of the time since Reagan. No guts, no leadership, no principles. Trump is teaching them a lesson they do not want to learn because it takes effort. Meanwhile,people like Diamond and Silk are pushing at the fence round the Dem’s plantation. Times, they are a changing.
Nixon.
Or possibly Ike.
A case could be made for as far back as Coolidge.