Henry Fonda
Role: Robert Leffingwell
Charles Laughton
Role: Senator Seabright Cooley
Don Murray
Role: Senator Brigham Anderson
Walter Pidgeon
Role: Senate Majority Leader
Peter Lawford
Role: Senator Lafe Smith
Gene Tierney
Role: Dolly Harrison
Franchot Tone
Role: The President
Lew Ayres
Role: The Vice President
Burgess Meredith
Role: Herbert Gelman
Eddie Hodges
Role: Johnny Leffingwell
Paul Ford
Role: Senator Stanley Danta
George Grizzard
Role: Senator Fred van Ackerman
Inga Swenson
Role: Ellen Anderson
Frank Sinatra
Role: Self (voice)
Edward Andrews
Role: Senator Orrin Knox
Paul McGrath
Role: Hardiman Fletcher
Will Geer
Role: Senate Minority Leader
Betty White
Role: Senator Bessie Adams
Tom Helmore
Role: British Ambassador
Rene Paul
Role: French Ambassador
Paul Stevens
Role: Louis Newborn
Russ Brown
Role: Night Watchman Mike
Malcolm Atterbury
Role: Senator Tom August
Janet Jane Carty
Role: Pidge Anderson
Hilary Eaves
Role: Lady Maudulayne
Michele Montau
Role: Celestine Barre
J. Edward McKinley
Role: Senator Powell Hanson
Bill Quinn
Role: Senator Paul Hendershot
Tiki Santos
Role: Senator Kanaho
Raoul De Leon
Role: Senator Velez
Chet Stratton
Role: Rev. Carney Birch
Betty Murray
Role: Senator Lafe Smith's Girlfriend
John Granger
Role: Ray Shaff
Meyer Davis
Role: Orchestra Conductor
Irv Kupcinet
Role: Journalist #1
Robert C. Wilson
Role: Journalist #2
Alan Emory
Role: Journalist #3
Jesse Stearns Buscher
Role: Journalist #4
Milton Berliner
Role: Journalist #5
Allan W. Cromley
Role: Journalist #6
William Knighton
Role: WHCA President
Guy M. Gillette
Role: Senator Harper
Henry Fountain Ashurst
Role: Senator McCafferty
Raj Mallick
Role: Indian Ambassador
Leon Alton
Role: Senator (uncredited)
Walter Bacon
Role: Senator (uncredited)
Joe Baird
Role: Senator (uncredited)
Eddie Baker
Role: Senator (uncredited)
Brandon Beach
Role: Senator (uncredited)
Mario Cimino
Role: Senator (uncredited)
Roger Clark
Role: Senator (uncredited)
Paul Cristo
Role: Senate Gallery Spectator (uncredited)
Harry Denny
Role: Senator (uncredited)
George DeNormand
Role: Senator (uncredited)
George Ford
Role: Senator (uncredited)
Cay Forester
Role: President's Secretary (uncredited)
Bobby Gilbert
Role: Senator (uncredited)
Polly Guggenheim
Role: Washington Socialite (uncredited)
Clive Halliday
Role: Senator (uncredited)
Helen Hardin
Role: Washington Socialite (uncredited)
Henry Jackson
Role: Drink Refuser (uncredited)
Virgil Johansen
Role: Senator (uncredited)
Kenner G. Kemp
Role: Senate Chamber Reporter (uncredited)
Joseph La Cava
Role: Senator (uncredited)
Evelyn Lincoln
Role: Washington Party Guest (uncredited)
Al McGranary
Role: Senator (uncredited)
William Meader
Role: Senator (uncredited)
Harold Miller
Role: Senate Official (uncredited)
Sol Murgi
Role: Senator (uncredited)
Norman Papson
Role: Gay Bar Patron (uncredited)
Charles Perry
Role: Senate Gallery Spectator (uncredited)
Paul Power
Role: Senator (uncredited)
Walter Reed
Role: Senate Staff Clerk (uncredited)
Leoda Richards
Role: Senator (uncredited)
Clark Ross
Role: Senator (uncredited)
John Roy
Role: Reporter (uncredited)
Carlisle Runge
Role: Washington Party Guest (uncredited)
Dick Ryan
Role: Senator (uncredited)
Jeffrey Sayre
Role: Senate Staff Clerk (uncredited)
Louis Scheyven
Role: Washington Party Guest (uncredited)
Bernard Sell
Role: Senator (uncredited)
Stephen Soldi
Role: Senate Gallery Spectator (uncredited)
Marion Lloyd Stearns White
Role: Washington Party Guest (uncredited)
Hal Taggart
Role: Senator (uncredited)
Wayne Tucker
Role: Journalist (uncredited)
Harty Wadsworth
Role: Washington Party Guest (uncredited)
Jerry Wadsworth
Role: Washington Party Guest (uncredited)
Byron White
Role: Washington Party Guest (uncredited)
