Like her support for Dr. Laura, Sarah Palin is using Twitter to hand out endorsements. Like she just did for Christine O’Donnell (after announcing her support on a radio show), who Palin wants to beat Rep. Mike Castle for the GOP nomination in Delaware’s U.S. Senate race. Yes, this is the same Christine O’Donnell whose campaign friends — but not O’Donnell herself, of course — have been insinuating Castle is a homogay. (So goes the Liberty.com web spot: “Isn’t Mike Castle cheating on his wife with a man?”) Not that a nod from Palin puts O’Donnell over the edge. It doesn’t.