CHARLES KRAUTHAMMER: This is all about Iowa. And because, again, if Trump wins Iowa, he is way ahead in New Hampshire. I think he is at that point unstoppable. And the reason I think this could be decisive is not because it helps Trump or it brings him additional support, but that it hurts Cruz.
The one thing standing between Trump and success in Iowa is Cruz. He attributes his success in becoming a Senator to her. She now turns against him. I think this is a major blow to him, and that's why I think it could be decisive.