- Mahalia Jackson - Mahalia Jackson
- Howard K. Smith - Howard K. Smith
- John Henry Faulk - Gov. T.T. Claypoole
- Richard Arlen - Sen. Oscar Anderson
- Penny Singleton - Mrs. Claypoole (scenes deleted)
- George Kirgo - Speechwriter
- George Furth - Tom
- Anne Newman Bacal - Janet (as Anne Newman)
- Mary Lawrence - Mrs. Merwin
- H.E. West - Sen. Lazarus
- Michael MacDonald - Zealot
- William R. Ebersol - Gov. John Merwin
- Natalie Masters - Mrs. Anderson
- Marie Blake - Cleaning Woman (as Blossom Rock)
- Bill Stout - Bill Stout
- Tyler McVey - Chairman
- Sherwood Keith - Doctor
- Leoda Richards - Convention Attendee (uncredited)
- Gore Vidal - Delegate (uncredited)
- John Alban - Banquet Guest (uncredited)
- Fred Aldrich - Delegate (uncredited)
- Leon Alton - Russell Supporter (uncredited)
- Don Ames - Supporter (uncredited)
- David Armstrong - Russell Campaign Worker (uncredited)
- Billy Beck - Party Guest (uncredited)
- George Bruggeman - Reporter (uncredited)
- Donald Chaffin - Supporter (uncredited)
- Dick Cherney - Reporter (uncredited)
- Noble 'Kid' Chissell - Man at Pool (uncredited)
- Rupert Crosse - Reporter (uncredited)
- Jack Daly - Photographer (uncredited)
- George DeNormand - Cantwell Supporter (uncredited)
- Kenneth Gibson - Reporter (uncredited)
- Herschel Graham - Campaign Worker (uncredited)
- Sam Harris - Cantwell Supporter (uncredited)
-
Jeannot Szwarc
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