That's just a way to change the debate. Instead of simply arguing the issue, smear your opponent, then demand your opponents talks about whether his "side" includes racists, and force the debate into disavowing these fringe elements. I could do the same for lefties too. Do I support racists who vote Republican? No. I wouldn't assume they - folks like the Ku Klux Klan - all vote Republican. I'm sure quite a few don't vote at all, or write in the name of their grand wizard (maybe Robert Byrd, for example ;-) ). You do know that there are more than 2 parties on ballots, after all, and typically these candidates are very much fringe.