Henry Fonda
Robert A. Leffingwell
Charles Laughton
Senator Seabright Cooley
Don Murray
Senator Brigham Anderson
Walter Pidgeon
Senate Majority Leader
Peter Lawford
Senator Lafe Smith
Gene Tierney
Dolly Harrison
Franchot Tone
The President
Lew Ayres
The Vice President
Burgess Meredith
Herbert Gelman
Eddie Hodges
Johnny Leffingwell
George Grizzard
Senator Fred Van Ackerman
Inga Swenson
Ellen Anderson
Paul McGrath
Hardiman Fletcher
Will Geer
Senate Minority Leader
Edward Andrews
Senator Orrin Knox
Betty White
Senator Bessie Adams
Malcolm Atterbury
Senator Tom August
Tiki Santos
Senator Kanaho
Raoul De Leon
Senator Velez
Tom Helmore
British Ambassador
Janet Jane Carty
Pidge Anderson
Russ Brown
Mike, the Night Watchman
Henry Fountain Ashurst
Senator McCafferty
Paul Ford
Senator Stanley Danta
J. Edward McKinley
Senator Powell Hanson
Bill Quinn
Senator Paul Hendershot
Hilary Eaves
Lady Maudulayne
Rene Paul
French Ambassador
Michele Montau
Celestine Barre
Raj Mallick
Indian Ambassador
Chet Stratton
Rev. Carney Birch
Paul Stevens
Louis Newborn
Leon Alton
Senator (uncredited)
Walter Bacon
Senator (uncredited)
Eddie Baker
Senator (uncredited)
Brandon Beach
Senator (uncredited)
Roger Clark
Senator (uncredited)
Harry Denny
Senator (uncredited)
George DeNormand
Senator (uncredited)
George Ford
Senator (uncredited)
Clive Halliday
Senator (uncredited)
William Meader
Senator (uncredited)
Sol Murgi
Senator (uncredited)
Paul Power
Senator (uncredited)
Dick Ryan
Senator (uncredited)
Bernard Sell
Senator (uncredited)
Hal Taggart
Senator (uncredited)
Paul Cristo
Senate Gallery Spectator (uncredited)
Stephen Soldi
Senate Gallery Spectator (uncredited)
Harold Miller
Senate Official (uncredited)
Walter Reed
Senate Staff Clerk (uncredited)
Jeffrey Sayre
Senate Staff Clerk (uncredited)
John Roy
Reporter (uncredited)
Cay Forester
President's Secretary (uncredited)