Challenge: The Solid South holds

Your challenge: With a POD of after the 1964 CRA is signed, have as much
of the South (especially the Deep South) as possible remain at least a swing
area, if not still heavily Democratic.
 
They continue to be discriminitory against minorities, women, homosexuals, and non-Christians. This will keep the south and give the Republicans everywhere else in the country until they decide it's not worth it.
 
They continue to be discriminitory against minorities, women, homosexuals, and non-Christians. This will keep the south and give the Republicans everywhere else in the country until they decide it's not worth it.

With a POD of after the 1964 CRA is signed
Given the OP's limits, I'm not sure it's possible but how about a combination of a reverse Great Migration of blacks and a more liberal mix of northern migrants to the Sun Belt. (Democrats in Georgia until 2002 and North Carolina until this year looked to me like they were going to succeed in moving from being the conservative party to being the liberal party without ever losing power but assuming the promised land is reachable, it apparently requires some time in the desert).
 
Republicans remain the moderate party or the left wing party as it was during the 50s, 60s, (and to a certain degree) the 70s
 
The GOP has not been left-wing since WWI, but the centrist argument is also flawed. I'll tell you why: because many of those Southern Democrats were conservative Republicans at heart but cynically retained the one-party system because it simplified things. The best example of this is Allan Shivers. Once they enter the GOP, plus the Goldwater candidacy of 1964, the GOP will by definition be pushed to the right. Otherwise you end up with an American version of our BQ in the South if both parties reject them. That's 127 EV, so any presidential candidate will have to be blackmailed before getting the votes. See 1876 or 1968 (where HHH would have to make concessions to Dixiecrats).
 
Massive Black voter registration combined with the working class white vote keeps the South Democratic?
 
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