Robert F. Kennedy was his brother's campaign manager for a U.S. Senate race.
Robert F. Kennedy . He was previously the 64th U.S. Attorney General from January 1961 to September 1964 , serving under his older brother President John F. Kennedy and his successor , President Lyndon B. Johnson . He began his political career in Massachusetts as the manager for his brother John 's successful campaign for the U.S. Senate in 1952 . Kennedy resigned from the committee to conduct his brother John 's campaign in the 1960 presidential election .