Henry Fonda
Role: William Russell
Cliff Robertson
Role: Joe Cantwell
Edie Adams
Role: Mabel Cantwell
Margaret Leighton
Role: Alice Russell
Shelley Berman
Role: Sheldon Bascomb
Lee Tracy
Role: President Art Hockstader
Ann Sothern
Role: Sue Ellen Gamadge
Gene Raymond
Role: Don Cantwell
Kevin McCarthy
Role: Dick Jensen
Mahalia Jackson
Role: Mahalia Jackson
Howard K. Smith
Role: Howard K. Smith
John Henry Faulk
Role: Gov. T.T. Claypoole
Richard Arlen
Role: Sen. Oscar Anderson
Penny Singleton
Role: Mrs. Claypoole (scenes deleted)
George Kirgo
Role: Speechwriter
Anne Newman Bacal
Role: Janet (as Anne Newman)
Mary Lawrence
Role: Mrs. Merwin
H.E. West
Role: Sen. Lazarus
Michael MacDonald
Role: Zealot
William R. Ebersol
Role: Gov. John Merwin
Natalie Masters
Role: Mrs. Anderson
Marie Blake
Role: Cleaning Woman (as Blossom Rock)
Bill Stout
Role: Bill Stout
Tyler McVey
Role: Chairman
Sherwood Keith
Role: Doctor
Leoda Richards
Role: Convention Attendee (uncredited)
Gore Vidal
Role: Delegate (uncredited)
John Alban
Role: Banquet Guest (uncredited)
Fred Aldrich
Role: Delegate (uncredited)
Leon Alton
Role: Russell Supporter (uncredited)
David Armstrong
Role: Russell Campaign Worker (uncredited)
Billy Beck
Role: Party Guest (uncredited)
George Bruggeman
Role: Reporter (uncredited)
Donald Chaffin
Role: Supporter (uncredited)
Dick Cherney
Role: Reporter (uncredited)
Noble 'Kid' Chissell
Role: Man at Pool (uncredited)
Rupert Crosse
Role: Reporter (uncredited)
Jack Daly
Role: Photographer (uncredited)
George DeNormand
Role: Cantwell Supporter (uncredited)
Kenneth Gibson
Role: Reporter (uncredited)
Herschel Graham
Role: Campaign Worker (uncredited)
Sam Harris
Role: Cantwell Supporter (uncredited)