The only Senate Democrat to switch parties was in fact Strom Thurmond. All the others Democrats STAYED Democrat. It wasn't until 1984 that Republicans won the South in the Presidential election and that was due to Mondale's stupidity of stating that he would raise people's taxes. It wasn't until 1988 that the South voted Republican in presidential elections and until the early 2000's that the South became solidly behind the Republicans. 2008: LA. 2010: NC. 2004: GA.
The reality is that Democrats have remained racist, but have gone on a different track: You can't succeed without our help, because you are Black. We White Liberals will help you and hold you up. We will hold you to lower moral and intellectual standards.