Senate Majority Leader Trent Lott (R-MS) is a good example: an aide to a Dem congressman who succeeded him in 1972 as a Republican:
Reps. Floyd Spence, Bo Calloway, Albert Watson, (later Sen.) Thad Cochran, Bill Mills, Tillie Fowler, etc.
Governors? Mills Godwin in VA.
In Georgia, for instance, the top five officials in the Capitol all switched from Dem to GOP in 1968.
But the trend is clear & well documented.
It asked if anyone could name the Democrats who "supposedly" switched to the Republicans over the party's changes on civil rights.