Perhaps it always was, and veering to the right was the aberration? Look at the heavyhanded Federalism present from the very beginning.
Dixicrats, with all their racist baggage but with all their inherent traditionalism, conservatism and preference for small, unobtrusive government, are what ultimately gave us a conservative Republican Party, beginning to build with Nixon in 68 and culminating with Reagan. It's been downhill since.
Southern evangelicals are derided now. It's code for former Dixiecrat. The party is returning to its roots.
I think you mean "beginning to build with Goldwater in 64".