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

Inga Swenson

Ellen Anderson

George Grizzard

Senator Fred van Ackerman

Paul McGrath

Hardiman Fletcher

Will Geer

Senate Minority Leader

Frank Sinatra

Self (voice)

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

John Granger

Ray Shaff

Russ Brown

Night Watchman Mike

Larry Tucker

Manuel

Sid Gould

Bartender

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

Betty Murray

Senator Lafe Smith's Girlfriend

Michele Montau

Celestine Barre

Raj Mallick

Indian Ambassador

Chet Stratton

Rev. Carney Birch

Meyer Davis

Orchestra Conductor

Irv Kupcinet

Journalist #1

Paul Stevens

Louis Newborn

Robert C. Wilson

Journalist #2

Alan Emory

Journalist #3

Leon Alton

Senator (uncredited)

Jesse Stearns Buscher

Journalist #4

Walter Bacon

Senator (uncredited)

Milton Berliner

Journalist #5

Eddie Baker

Senator (uncredited)

Allan W. Cromley

Journalist #6

Brandon Beach

Senator (uncredited)

William Knighton

WHCA President

Roger Clark

Senator (uncredited)

Guy M. Gillette

Senator Harper

Harry Denny

Senator (uncredited)

George DeNormand

Senator (uncredited)

George Ford

Senator (uncredited)

Clive Halliday

Senator (uncredited)

William Meader

Senator (uncredited)

Joe Baird

Senator (uncredited)

Sol Murgi

Senator (uncredited)

Paul Power

Senator (uncredited)

Dick Ryan

Senator (uncredited)

Mario Cimino

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)

Bobby Gilbert

Senator (uncredited)

Polly Guggenheim

Washington Socialite (uncredited)

John Roy

Reporter (uncredited)

Cay Forester

President's Secretary (uncredited)

Helen Hardin

Washington Socialite (uncredited)

Henry Jackson

Drink Refuser (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)

Norman Papson

Gay Bar Patron (uncredited)

Charles Perry

Senate Gallery Spectator (uncredited)

Leoda Richards

Senator (uncredited)

Clark Ross

Senator (uncredited)

Carlisle Runge

Washington Party Guest (uncredited)

Louis Scheyven

Washington Party Guest (uncredited)

Marion Lloyd Stearns White

Washington Party Guest (uncredited)

Wayne Tucker

Journalist (uncredited)

Harty Wadsworth

Washington Party Guest (uncredited)

Jerry Wadsworth

Washington Party Guest (uncredited)

Byron White

Washington Party Guest (uncredited)