That is a great sign. I may steal it.
I'm also thinking of a large picture of some terrorists, maybe the guys who killed Nick Berg, and a caption that reads, "Cindy calls them 'freedom fighters.'" Or just plain wording that says "Al-Qaeda in Iraq are not freedom fighters."
How about a photo of our soldiers in Fallujah along with photo of Cindy Sheehan with the group Code Pink who gave $ to the insurgents right before our troops took the city?
and the sign reads Grieving should NOT excuse Treason