Suing O'Donnell would not help - it would only make him look legit. Better to point at him and laugh.
Years from now, some trivia show will be explaining the difference between O'Donnell, Baghdad Bob, and Joe Isuzu. If you're old then and can remember which one is which, that will be a good day.
I'd like to see O'Donnell get sued for libel by Rove's attorney.
I'd like to end up in a dark alley with O'Donnell. The chicken s##%t would be in a world of hurt.