Guggenheim worked on Robert F. Kennedy's presidential campaign; after Sen. Kennedy was assassinated, Guggenheim was asked by the Kennedy family to put together a tribute for the 1968 Chicago Convention. It was completed in less than two months. It was shown at the convention and broadcast simultaneously. The convention hall came to a standstill for twenty minutes. The resulting film, "Robert Kennedy Remembered" (1968), won the Academy Award for Best Live Action Short Film. Although Guggenheim occasionally ventured into feature and political film production, he stayed mostly with documentary films. Charles quit producing political campaign advertisements in the early 1980s saying, "If you play the piano in a house full of ill repute, it doesn't matter how well you play the piano." He won two more Oscars for short subject documentary film-making, for "The Johnstown Flood" (1989) and "A Time for Justice" (1995). He received twelve nominations in total.