news it's been waiting for for ten years, osama bin laden, the maniacal mass murder, religious fan pastic, responsible for the tragedies that took place here, at the pentagon and on flight 93, he is dead. killed by american navy s.e.a.l.s who staged a daring raid on a mansion where he was living in pakistan. tonight, the president spoke again. this time, to a bipartisan crowd in washington. a city that has lately seemed poisoned by partisan venom. he hailed a feeling of national unity that is surprisingly familiar. >> i think we experienced the same sense of unity that prevailed on 9/11. we're reminded again that there is a pride in what this nation stands for. and what we can achieve. that runs far deeper than party, far deeper than politics. >> one of the most captivating, most fascinating threads of this story is how american spies tracked their man to that compound. how they confirmed as best they could that it was really him. and how the decision was made to attack not with an air strike as initially proposed but with a brazen commando mission in which navy s.e.a.l.s would descend fr