Low-authoritarian politicians in the South are almost always Democrats

Evidence

But we saw that flip-flop only in Louisiana. There were lots of High RWA Democrats in the South, but the Low RWA legislators south of the Mason-Dixon Line were almost always Democrats too. Outside Connecticut, Low RWAs seeking political careers either do not often join the Republican Party or do not advance in it unless they change their beliefs. — Bob Altemeyer, The Authoritarian Specter, 3714