If I find some time, I will dig it up. To think that democrats after over 100 years of voting democrat in the south would turn and vote GOP is pure revisionism.
It doesn't make a whole lot of sense because statewide and local elections in the South still were overwhelmingly Democrat. It is true that the South turned Pubbie for Presidential elections, but I don't think that could have been predicted, as Nixon is excoriated for the "Southern strategy".
I prefer to believe the n-word comment because (a) that sounds more like Johnson and (b) he was a ruthless political animal and would do nothing to devastate his party. It seems much more reasonable that the already Democrat-leaning black electorate would begin to be locked in with that legislation, delivering the urban North to the Democrats and the neo-Confederates would hold the South.
It gave the Dems dominance for two generations.