*cough*They'll always give you that "the parties flipped" line.
I once saw @S'task do an excellent takedown of that bullshit line, and can never reproduce it to the same quality.
I don't think I've written anything like that on TS. I think you're thinking about something someone wrote on SB where he demonstrated the long term presidential voting history of southern states showcasing how they began shifting towards Republicans long, LONG before the Voting Rights Act and the supposed "party switch" happened, and how there was a stronger correlation between the growth of a successful middle class in a state and the rise of voting Republican... oh and that Black voters began drifting towards the Democrats also long before the supposed "party switch" specifically along with the rise of the welfare state under FDR...