UPDATE: St. Louis County police say six people were arrested. Two of those were arrested on suspicion of assault, one of resisting arrest and three on suspicion of committing peace disturbances. Carnahan was gone when the ruckus started. Kenneth Gladney, a 38-year-old conservative activist from St. Louis, said he was attacked by some of those arrested as he handed out yellow flags with “Don't tread on me” printed on them. He spoke to the Post-Dispatch from the emergency room of the St. John's Mercy Medical Center, where he said he was waiting to be treated for injuries to his knee,...