Fifty years ago today, President John F. Kennedy was assassinated. The horror of a U.S. president being murdered was, by itself, enough to ensure the event would burn itself into most memories and into the history books. But he was more than just any president. He was young, charismatic, handsome, and carried himself with a "vigah" (to borrow his broad Boston accent) that belied his many health problems. He was a rock star of a president, one who made the country feel that we could and would change the world for the better.