I more or less detest Cindy Sheehan, despite the magnitude of her loss, but it was outrageous of the Capitol cops to disturb her, let alone arrest her, because she wore a T-shirt with a political message. It was delightful karmic retribution that the same force then had to figure out what to do about a T-shirt with a less disagreeable political message, worn by the wife of (so I read) an influential member of Congress.
Note to everyone connected in any way with any branch of government or law enforcement: the First Amendment specifically protects "the right of the people . . . to petition the Government for a redress of grievances." If a law enforcement officer has occasion to shout "Protester!" when spotting a political T-shirt, it should be in respectful recognition of a citizen exercising this basic right -- saying "Right on!", if you will.