Henry Fonda

as Robert Leffingwell

Charles Laughton

as Senator Seabright Cooley

Don Murray

as Senator Brigham Anderson

Walter Pidgeon

as Senate Majority Leader

Peter Lawford

as Senator Lafe Smith

Gene Tierney

as Dolly Harrison

Franchot Tone

as The President

Lew Ayres

as The Vice President

Burgess Meredith

as Herbert Gelman

Eddie Hodges

as Johnny Leffingwell

Paul Ford

as Senator Stanley Danta

George Grizzard

as Senator Fred van Ackerman

Inga Swenson

as Ellen Anderson

Frank Sinatra

as Self (voice)

Edward Andrews

as Senator Orrin Knox

Paul McGrath

as Hardiman Fletcher

Will Geer

as Senate Minority Leader

Betty White

as Senator Bessie Adams

Tom Helmore

as British Ambassador

Rene Paul

as French Ambassador

Paul Stevens

as Louis Newborn

Russ Brown

as Night Watchman Mike

Malcolm Atterbury

as Senator Tom August

Janet Jane Carty

as Pidge Anderson

Hilary Eaves

as Lady Maudulayne

Michele Montau

as Celestine Barre

J. Edward McKinley

as Senator Powell Hanson

Bill Quinn

as Senator Paul Hendershot

Tiki Santos

as Senator Kanaho

Raoul De Leon

as Senator Velez

Chet Stratton

as Rev. Carney Birch

Larry Tucker

as Manuel

Betty Murray

as Senator Lafe Smith's Girlfriend

John Granger

as Ray Shaff

Sid Gould

as Bartender

Meyer Davis

as Orchestra Conductor

Irv Kupcinet

as Journalist #1

Robert C. Wilson

as Journalist #2

Alan Emory

as Journalist #3

Jesse Stearns Buscher

as Journalist #4

Milton Berliner

as Journalist #5

Allan W. Cromley

as Journalist #6

William Knighton

as WHCA President

Guy M. Gillette

as Senator Harper

Henry Fountain Ashurst

as Senator McCafferty

Raj Mallick

as Indian Ambassador

Leon Alton

as Senator (uncredited)

Walter Bacon

as Senator (uncredited)

Joe Baird

as Senator (uncredited)

Eddie Baker

as Senator (uncredited)

Brandon Beach

as Senator (uncredited)

Mario Cimino

as Senator (uncredited)

Roger Clark

as Senator (uncredited)

Paul Cristo

as Senate Gallery Spectator (uncredited)

Harry Denny

as Senator (uncredited)

George DeNormand

as Senator (uncredited)

George Ford

as Senator (uncredited)

Cay Forester

as President's Secretary (uncredited)

Bobby Gilbert

as Senator (uncredited)

Polly Guggenheim

as Washington Socialite (uncredited)

Clive Halliday

as Senator (uncredited)

Helen Hardin

as Washington Socialite (uncredited)

Henry Jackson

as Drink Refuser (uncredited)

Virgil Johansen

as Senator (uncredited)

Kenner G. Kemp

as Senate Chamber Reporter (uncredited)

Joseph La Cava

as Senator (uncredited)

Evelyn Lincoln

as Washington Party Guest (uncredited)

Al McGranary

as Senator (uncredited)

William Meader

as Senator (uncredited)

Harold Miller

as Senate Official (uncredited)

Sol Murgi

as Senator (uncredited)

Norman Papson

as Gay Bar Patron (uncredited)

Charles Perry

as Senate Gallery Spectator (uncredited)

Paul Power

as Senator (uncredited)

Walter Reed

as Senate Staff Clerk (uncredited)

Leoda Richards

as Senator (uncredited)

Clark Ross

as Senator (uncredited)

John Roy

as Reporter (uncredited)

Carlisle Runge

as Washington Party Guest (uncredited)

Dick Ryan

as Senator (uncredited)

Jeffrey Sayre

as Senate Staff Clerk (uncredited)

Louis Scheyven

as Washington Party Guest (uncredited)

Bernard Sell

as Senator (uncredited)

Stephen Soldi

as Senate Gallery Spectator (uncredited)

Marion Lloyd Stearns White

as Washington Party Guest (uncredited)

Hal Taggart

as Senator (uncredited)

Wayne Tucker

as Journalist (uncredited)

Harty Wadsworth

as Washington Party Guest (uncredited)

Jerry Wadsworth

as Washington Party Guest (uncredited)

Byron White

as Washington Party Guest (uncredited)