There were plenty of Republicans in that 89th Congress who passed LBJ’s programs for him. In fact you’ll often hear conservative talking heads boasting about how Republicans were responsible passing the 1964 Civil Rights Act. Well they’re right, although that doesn’t explain why any conservative with a lick of sense would brag about it. Both Goldwater and Ronald Reagan opposed the bill, knowing where it would ultimately lead.
So we see the consequences of a 'Rat super majority, a minority led by a self-proclaimed moderate, and a 'Rat in the WH. The sheer volume and utter failure of legislation passed in those two sessions is something few today understand or appreciate, but it should serve as warning against the apparent drift back to the 'Rat principles.
Neocon Ttotskyists usurped the RNC after WWII. That is why they opposed both Goldwater and Reagan.