JFK assassination: The world remembers president, 50 years on In Washington, Kennedy family members gathered at his grave in Arlington cemetery, while President Barack Obama met leaders of the Peace Corps, one of JFK's most enduring legacies. On government buildings across the city and the country, flags were lowered to half mast. For the first time, the city of Dallas commemorated the event that has made its very name a synonym for the crime. In Dealey Plaza, a sombre ceremony took place in the shadow of the Texas School Book Depository building from where Lee Harvey Oswald fired the fatal shots on the presidential motorcade. At 12.30 pm local time, bells tolled through the city to mark the moment of the assassination. The tickets-only occasion for 5,000 was intended to focus on the 1,000 days of Kennedy's presidency, rather than the moments in which it ended. It featured a brief speech by the Dallas mayor, Mike Rawlings, and readings by the historian David McCullough of excerpts from some of Kennedy's most famous speeches. On the "grassy knoll," central to so many conspiracy theories, a monument was unveiled, inscribed with the final paragraph of the speech Kennedy was to have given that day at a luncheon organised by Dallas civic leaders. Its inspirational language, so typical of the speaker, echoes down the decades. Americans, the 35th president planned to say, were "the watchmen on the walls of world freedom." But the cause must be righteous, "for as was written long ago, "except the Lord keep the city, the watchman waketh but in vain."" That day in Dallas, no watchman prevented what happened. But the golden glow of the martyred president endures. A CNN poll today showed that, half a century after he died, JFK's approval rating stands at 90 per cent, eclipsing every occupant of the Oval Office since.