It is hard to believe this but the Democrat Party had a conservative wing at one point. Not anymore.
Wilson was the first progressive. The south voted universally for him. FDR was a prog. The south voted universally for him. Adlai Stevenson was a liberal dhimmicrat. The south voted conclusively for him. LBJ was a hard leftist. Half of the south voted for him. Carter was a liberal dhimmicrat. The south voted universally for him.
So much for the conservative wing.