I think at least some of our Lost Causers are the last of the old Dixiecrats, or maybe their children & grandchildren.
The Dixiecrat 1948 candidate, Strom Thurmond, became a Republican in 1964 and so we have those people in our party.
At about that same time a former West Virginia KKK Exalted Cyclops was moving up to Democrat leadership in the US Senate, so it's just not correct to say that all the old racists became Republicans.