A week ago, I wrote about the signs that this was in the offing.
Also, to correct an earlier story, the account of a gay Wisconsinite supporting a Republican candidate who claimed he was beaten by the gay husband of a gay Democrat candidate seems to have been a put-up job. That was an attempt at pre-emptive delegtimization, too, and I hope the guy gets the book thrown at him . . . and the help he obviously needs.
UPDATE: Thanks to Maetenloch for the link.
REUPDATE (10-31-12): Per Jeff, Limbaugh is arguing something like this today.