President John F. Kennedy's staffers, who were mostly northeastern ivy league elites and despised Texan Vice-President Lyndon B. Johnson's rural speech patterns, used to refer to Johnson behind his back as 'Uncle Cornpone' or 'Rufus Cornpone'.
His other film roles include Cornbread, Earl and Me (1975), Bucktown (1975), The Last Hard Men (1976), The Boss' Wife (1986), New Jack City (1991) and his last film role as General Afir in Mom and Dad Save the World.