WASHINGTON, D.C.—Cold and sunny, the mood anticipating the arrival of the president was electric. At the National Mall, people who had flown in from all over the country and some from other parts of the world, filled the seats, covered the green lawn and lined the barriers. It was a beautiful occasion, even for the second time. But even more special, it was the day America recognized one of the greatest civil rights leaders the world has known—the Rev. Dr. Martin Luther King.