She was arrested for committing a misdemeanor in the room where the State of the Union speech was held:
Cindy Sheehan, the mother of a fallen soldier in Iraq who reinvigorated the anti-war movement, was arrested and removed from the House gallery Tuesday night just before President Bush's State of the Union address, a police spokeswoman said.
Sheehan, who had been invited to attend the speech by Rep. Lynn Woolsey, D-Calif., was charged with demonstrating in the Capitol building, a misdemeanor, said Capitol Police Sgt. Kimberly Schneider. Sheehan was taken in handcuffs to police headquarters a few blocks away and her case was processed as Bush spoke.
Schneider said Sheehan had worn a T-shirt with an anti-war slogan to the speech and covered it up until she took her seat. Police warned her that such displays were not allowed, but she did not respond, the spokeswoman said.