So Robin Carnahan has submitted a motion to dismiss the Fox News suit against her for copyright violation, based on an attack ad she ran against her Senate opponent Roy Blunt that used clips from a Chris Wallace interview.
Carnahan's camp is presenting two really awesome arguments:
1) Fox didn't bother to copyright the footage until after they'd filed the lawsuit.
2) The Fox footage itself contains public domain footage from C-Span, and is thus uncopyrightable.
So Fox isn't just being blatantly partisan, they're being incompetently blatantly partisan. Fantastic.