Henry Fonda as William Russell

Cliff Robertson as Joe Cantwell

Edie Adams as Mabel Cantwell

Margaret Leighton as Alice Russell

Shelley Berman as Sheldon Bascomb

Lee Tracy as President Art Hockstader

Ann Sothern as Sue Ellen Gamadge

Gene Raymond as Don Cantwell

Kevin McCarthy as Dick Jensen

Mahalia Jackson as Mahalia Jackson

Howard K. Smith as Howard K. Smith

John Henry Faulk as Gov. T.T. Claypoole

Richard Arlen as Sen. Oscar Anderson

Penny Singleton as Mrs. Claypoole (scenes deleted)

George Kirgo as Speechwriter

George Furth as Tom

Anne Newman Bacal as Janet (as Anne Newman)

Mary Lawrence as Mrs. Merwin

H.E. West as Sen. Lazarus

Michael MacDonald as Zealot

William R. Ebersol as Gov. John Merwin

Natalie Masters as Mrs. Anderson

Marie Blake as Cleaning Woman (as Blossom Rock)

Bill Stout as Bill Stout

Tyler McVey as Chairman

Sherwood Keith as Doctor

Leoda Richards as Convention Attendee (uncredited)

Gore Vidal as Delegate (uncredited)

John Alban as Banquet Guest (uncredited)

Fred Aldrich as Delegate (uncredited)

Leon Alton as Russell Supporter (uncredited)

David Armstrong as Russell Campaign Worker (uncredited)

Billy Beck as Party Guest (uncredited)

George Bruggeman as Reporter (uncredited)

Donald Chaffin as Supporter (uncredited)

Dick Cherney as Reporter (uncredited)

Noble 'Kid' Chissell as Man at Pool (uncredited)

Rupert Crosse as Reporter (uncredited)

Jack Daly as Photographer (uncredited)

George DeNormand as Cantwell Supporter (uncredited)

Kenneth Gibson as Reporter (uncredited)

Herschel Graham as Campaign Worker (uncredited)

Sam Harris as Cantwell Supporter (uncredited)