CLEVELAND: He still remembers the first gunshot. Then came another shot. And another. And the president slumped down. For so many nights afterward, he relived that grisly moment in his dreams. Now, 60 years later, Paul Landis, one of the Secret Service agents just feet away from President John F Kennedy on that fateful day in Dallas, is telling his story in full for the first time. And in at least one key respect, his account differs from the official version.His memory challenges the theory advanced by the...