In an interview airing tonight at 9pmET/PT, Christine O'Donnell walks off the set of "Piers Morgan Tonight" following questions about gay marriage. "You're borderline being a little bit rude," she tells Piers Morgan. "I think I'm being rather charming and respectful," says Morgan.

O'Donnell was on to talk about her new book "Troublemaker." Watch the full interview tonight at 9pmET/PT – also on the show is Starbucks CEO Howard Schultz.

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