That's only because he's outlived all the Republican Klansmen.
Let's not forget that at the time of the Civil Right Act those racists that were voting against integration were Southern Democrats. But after feeling betrayed or alienated by their Northern party members, who were in favor of integration, they left the Democratic party. Now which party was there waiting to greet them with open arms? Yes, the same party which to this day still controls the South. The Republican party. Both parties have a history of racism, but I'd venture to guess that today the Democrats are far more tolerant than Republicans are. Mainly due to the Southern Republicans and racists like Tom Tancredo out west.