James Stewart

Jefferson Smith

Jean Arthur

Clarissa Saunders

Claude Rains

Joseph Paine

Edward Arnold

Jim Taylor

Guy Kibbee

Governor Hopper

Thomas Mitchell

Diz Moore

Eugene Pallette

Chick McGann

Beulah Bondi

Ma Smith

H.B. Warner

Senate Majority Leader

Harry Carey

President of the Senate

Astrid Allwyn

Susan Paine

Ruth Donnelly

Emma Hopper

Grant Mitchell

Senator MacPherson

Porter Hall

Senator Monroe

Pierre Watkin

Senator Barnes

Charles Lane

Nosey

William Demarest

Bill Griffith

Dick Elliott

Carl Cook

Billy Watson

Peter Hopper

Delmar Watson

Jimmie Hopper

John Russell

Hopper Boy

Harry Watson

Hopper Boy

Garry Watson

Hopper Boy

Larry Simms

Hopper Boy

H.V. Kaltenborn

Radio Broadcaster

Russell Simpson

Kenneth Allen (uncredited)

Frances Gifford

Hopper Girl (uncredited)

Colin James Mackey

Narrator (uncredited)

Wilson Benge

Hopper's Butler (uncredited)

Dickie Jones

Richard Jones (uncredited)

Erville Alderson

Handwriting Expert (uncredited)

Frank Puglia

Handwriting Expert (uncredited)

Maurice Cass

Handwriting Expert (uncredited)

Stanley Andrews

Senator Hodges (uncredited)

Al Bridge

Senator Dwight (uncredited)

Edwin August

Senator (uncredited)

Edmund Cobb

Senator Gower (uncredited)

Sam Ash

Senator Lancaster (uncredited)

Harry A. Bailey

Senator Hammett (uncredited)

Stanley Mack

Senator (uncredited)

Brooks Benedict

Senate Clerk (uncredited)

Wade Boteler

Family Man (uncredited)

Dorothy Comingore

Woman at Station (uncredited)

Chester Conklin

Reporter (uncredited)

Gino Corrado

Barber (uncredited)

Ann Doran

Paine's Secretary (uncredited)

Robert Emmett Keane

Editor (uncredited)

Matt McHugh

Reporter (uncredited)

William Arnold

Reporter (uncredited)

Robert Sterling

Senate Reporter (uncredited)

Dub Taylor

Reporter (uncredited)

George Chandler

Reporter (uncredited)

Jack Carson

Sweeney Farrell (uncredited)

Dora Clement

Mrs. McGann (uncredited)

Bert Moorhouse

Man in Senate Building (uncredited)

Harry C. Bradley

Arthur Kim (uncredited)

Harlan Briggs

Mr. Edwards (uncredited)

Davison Clark

Committeeman (uncredited)

Richard Clucas

(uncredited)

Eddie Coke

Photographer (uncredited)

Alec Craig

Speaker (uncredited)

Georgie Cooper

Committeewoman (uncredited)

Jack Cooper

Photographer (uncredited)

Maurice Costello

Diggs (uncredited)

Lew Davis

Senate Clerk (uncredited)

Byron Foulger

Hopper's Secretary (uncredited)

Helen Jerome Eddy

Paine's Secretary (uncredited)

Douglas Evans

Francis Scott Key (uncredited)

Joe Devlin

Waiter (uncredited)

Lester Dorr

Taylor's Stooge (uncredited)

Robert Dudley

Reporter (uncredited)

Edward Earle

Reporter (uncredited)

Eddie Fetherston

Senate Reporter (uncredited)

Jack Gardner

Reporter (uncredited)

Mary Gordon

Woman (uncredited)

Harry Hayden

First Radio Announcer (uncredited)

Louis Jean Heydt

Soapbox Speaker (uncredited)

Frank Jaquet

Senator Byron (uncredited)

Philo McCullough

Senator Albert (uncredited)

Olaf Hytten

Butler (uncredited)

Lloyd Ingraham

Committeeman (uncredited)

Mitchell Ingraham

(uncredited)

Donald Kerr

Reporter (uncredited)

Milton Kibbee

Senate Reporter (uncredited)

Paul Kruger

Bodyguard (uncredited)

Jackie Lowe

Boy Ranger (uncredited)

George Lloyd

Hoodlum (uncredited)

Jack Low

Hoodlum (uncredited)

Hank Mann

Photographer (uncredited)

Margaret Mann

Nun (uncredited)

Eric Mayne

Man in Senate Building (uncredited)

Wilfred Lucas

Pompous Man (uncredited)

William Newell

Reporter (uncredited)

James Millican

Senate Reporter (uncredited)

Howard M. Mitchell

Shoe Salesman (uncredited)

Gene Morgan

Reporter (uncredited)

Frank O'Connor

Senator Alfred (uncredited)

Joe Palma

Hoodlum (uncredited)

Charles Regan

Hoodlum (uncredited)

Jack Rice

Lang (uncredited)

Wyndham Standing

Senator Ashman (uncredited)

Ferris Taylor

Senator Carlisle (uncredited)

Jack Richardson

Senator Manchester (uncredited)

Walter Soderling

Senator Pickett (uncredited)

Craig Stevens

Senate Reporter (uncredited)

Walter Sande

Newspaperman with Pipe (uncredited)

Harry Strang

Bodyguard (uncredited)

Harry Tenbrook

Bodyguard (uncredited)

Dave Willock

Senate Guard (uncredited)

Frederick Vroom

Paine's Friend (uncredited)

Layne Tom Jr.

Boy Ranger (uncredited)

Emma Tansey

Committeewoman (uncredited)

Florence Wix

Committeewoman (uncredited)

Larry Steers

Committeeman (uncredited)

Edward Biby

Foreign Diplomat (uncredited)

David Wade

(uncredited)

Frank McLure

Senator (uncredited)