 It's part of human nature. But politics must never be a literal battlefield, a God forbid, a killing field. One of the big questions is how the attack could have happened at a routine event. Former Secret Service Deputy Director A.T. Smith is a consultant for CBS News. I spoke to my sources at the Secret Service, and this was like any other planned advance. They were there, you know, several days in advance, so there was no short notice or anything like that.