Henry Fonda

Robert 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

Paul Ford

Senator Stanley Danta

George Grizzard

Senator Fred van Ackerman

Inga Swenson

Ellen Anderson

Frank Sinatra

Self (voice)

Edward Andrews

Senator Orrin Knox

Paul McGrath

Hardiman Fletcher

Will Geer

Senate Minority Leader

Betty White

Senator Bessie Adams

Tom Helmore

British Ambassador

Rene Paul

French Ambassador

Paul Stevens

Louis Newborn

Russ Brown

Night Watchman Mike

Malcolm Atterbury

Senator Tom August

Janet Jane Carty

Pidge Anderson

Hilary Eaves

Lady Maudulayne

Michele Montau

Celestine Barre

J. Edward McKinley

Senator Powell Hanson

Bill Quinn

Senator Paul Hendershot

Tiki Santos

Senator Kanaho

Raoul De Leon

Senator Velez

Chet Stratton

Rev. Carney Birch

Larry Tucker

Manuel

Betty Murray

Senator Lafe Smith's Girlfriend

John Granger

Ray Shaff

Sid Gould

Bartender

Meyer Davis

Orchestra Conductor

Irv Kupcinet

Journalist #1

Robert C. Wilson

Journalist #2

Alan Emory

Journalist #3

Jesse Stearns Buscher

Journalist #4

Milton Berliner

Journalist #5

Allan W. Cromley

Journalist #6

William Knighton

WHCA President

Guy M. Gillette

Senator Harper

Henry Fountain Ashurst

Senator McCafferty

Raj Mallick

Indian Ambassador

Leon Alton

Senator (uncredited)

Walter Bacon

Senator (uncredited)

Joe Baird

Senator (uncredited)

Eddie Baker

Senator (uncredited)

Brandon Beach

Senator (uncredited)

Mario Cimino

Senator (uncredited)

Roger Clark

Senator (uncredited)

Paul Cristo

Senate Gallery Spectator (uncredited)

Harry Denny

Senator (uncredited)

George DeNormand

Senator (uncredited)

George Ford

Senator (uncredited)

Cay Forester

President's Secretary (uncredited)

Bobby Gilbert

Senator (uncredited)

Polly Guggenheim

Washington Socialite (uncredited)

Clive Halliday

Senator (uncredited)

Helen Hardin

Washington Socialite (uncredited)

Virgil Johansen

Senator (uncredited)

Kenner G. Kemp

Senate Chamber Reporter (uncredited)

Joseph La Cava

Senator (uncredited)

Evelyn Lincoln

Washington Party Guest (uncredited)

Al McGranary

Senator (uncredited)

William Meader

Senator (uncredited)

Harold Miller

Senate Official (uncredited)

Sol Murgi

Senator (uncredited)

Norman Papson

Gay Bar Patron (uncredited)

Charles Perry

Senate Gallery Spectator (uncredited)

Paul Power

Senator (uncredited)

Walter Reed

Senate Staff Clerk (uncredited)

Leoda Richards

Senator (uncredited)

Clark Ross

Senator (uncredited)

John Roy

Reporter (uncredited)

Carlisle Runge

Washington Party Guest (uncredited)

Dick Ryan

Senator (uncredited)

Jeffrey Sayre

Senate Staff Clerk (uncredited)

Louis Scheyven

Washington Party Guest (uncredited)

Bernard Sell

Senator (uncredited)

Stephen Soldi

Senate Gallery Spectator (uncredited)

Marion Lloyd Stearns White

Washington Party Guest (uncredited)

Hal Taggart

Senator (uncredited)

Wayne Tucker

Journalist (uncredited)

Harty Wadsworth

Washington Party Guest (uncredited)

Jerry Wadsworth

Washington Party Guest (uncredited)

Byron White

Washington Party Guest (uncredited)

Scoop Jackson

Drink Refuser (uncredited)