Five years have passed since September 11, but for Rudy Giuliani, it's as if the disaster happened yesterday. When we needed a leader, he walked the canyons of Lower Manhattan, covered in soot and rallying a panicked city through a morning turned suddenly dark. Nearly 2,000 days and two foreign wars later, his image remains as compelling a symbol of that transforming moment as the crumbling towers. As he prepares for the presidential campaign that has been his dream since he was in college, that is surely what he hopes voters will remember.