Omar Khadr seems an unlikely poster boy for the war on terror. Khadr is a Canadian citizen, he likes Harry Potter, and he was only 15 years old when he was captured by the U.S. Army in Afghanistan. And that's what makes his case so controversial: his age. As correspondent Bob Simon reports, Omar Khadr is the only person in modern history to be charged for war crimes he allegedly committed while a minor. 60 Minutes got a rare glimpse into a Guantanamo case -- one of the first that will be prosecuted. Consider this: is Omar Khadr a hardened...