FILE - In this June 5, 1968 file photo, presidential hopeful Sen. Robert F. Kennedy waves goodbye to his supporters as he prepares to leave the Ambassador Hotel ballroom in Los Angeles, before exiting through a kitchen backatage. A day after meeting his hero Robert Kennedy, hotel busboy Juan Romero raced to congratulate the senator moments after his victory in the California presidential primary. After Kennedy briefly paused to shake the hand of the Mexican-born 17-year-old, an assassin gunned down Kennedy in front of Romero, fostering a guilt that would last for decades. (AP Photo/Dick Strobel, File)