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

Delmar Watson

Jimmie Hopper

John Russell

Hopper Boy

Larry Simms

Hopper Boy

Russell Simpson

Kenneth Allen (uncredited)

Frances Gifford

Hopper Girl (uncredited)

Wilson Benge

Hopper's Butler (uncredited)

Dickie Jones

Richard Jones (uncredited)

Erville Alderson

Handwriting Expert (uncredited)

Frank Puglia

Handwriting Expert (uncredited)

Stanley Andrews

Senator Hodges (uncredited)

Edmund Cobb

Senator Gower (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)

Frank Austin

Inventor (uncredited)

Robert Sterling

Senate Reporter (uncredited)

Dub Taylor

Reporter (uncredited)

George Chandler

Reporter (uncredited)

Fred 'Snowflake' Toones

Porter (uncredited)

Jack Carson

Sweeney Farrell (uncredited)

Tommy Bupp

Cheering Boy (uncredited)

Bert Moorhouse

Man in Senate Building (uncredited)

Harlan Briggs

Mr. Edwards (uncredited)

Frederick Burton

Senator Dearhorn (uncredited)

Eddy Chandler

Reporter (uncredited)

Anne Cornwall

Senate Reporter (uncredited)

George Cooper

Waiter (uncredited)

Vernon Dent

Senate Reporter (uncredited)

Harry Depp

Hat Salesman / Secretary (uncredited)

Byron Foulger

Hopper's Secretary (uncredited)

Helen Jerome Eddy

Paine's Secretary (uncredited)

Joe Devlin

Waiter (uncredited)

Lester Dorr

Taylor's Stooge (uncredited)

Edward Earle

Reporter (uncredited)

Jack Gardner

Reporter (uncredited)

Mary Gordon

Woman (uncredited)

Lorna Gray

Woman at Station (uncredited)

Louis Jean Heydt

Soapbox Speaker (uncredited)

Frank Jaquet

Senator Byron (uncredited)

Philo McCullough

Senator Albert (uncredited)

Philip Hurlic

Boy Ranger (uncredited)

Olaf Hytten

Butler (uncredited)

Lloyd Ingraham

Committeeman (uncredited)

Eddie Kane

Reporter (uncredited)

Donald Kerr

Reporter (uncredited)

Milton Kibbee

Senate Reporter (uncredited)

Joe King

Summers (uncredited)

Evalyn Knapp

Reporter (uncredited)

Paul Kruger

Bodyguard (uncredited)

Bobby Larson

Boy Ranger (uncredited)

Vera Lewis

Mrs. Edwards (uncredited)

George Lloyd

Hoodlum (uncredited)

Arthur Loft

Chief Clerk (uncredited)

Mary MacLaren

Head Sister (uncredited)

Hank Mann

Photographer (uncredited)

Margaret Mann

Nun (uncredited)

Eric Mayne

Man in Senate Building (uncredited)

Lafe McKee

Veteran at Lincoln Memorial (uncredited)

Wilfred Lucas

Pompous Man (uncredited)

William Newell

Reporter (uncredited)

Robert Middlemass

Radio Announcer #2 (uncredited)

James Millican

Senate Reporter (uncredited)

Charles R. Moore

Porter (uncredited)

Gene Morgan

Reporter (uncredited)

Frank O'Connor

Senator Alfred (uncredited)

Wyndham Standing

Senator Ashman (uncredited)

Ferris Taylor

Senator Carlisle (uncredited)

Jack Richardson

Senator Manchester (uncredited)

Walter Soderling

Senator Pickett (uncredited)

Carl Stockdale

Senator Burdette (uncredited)

Bob Walker

Senator Holland (uncredited)

Henry Roquemore

Senator (uncredited)

Craig Stevens

Senate Reporter (uncredited)

Paul Stanton

Flood a Newsman (uncredited)

Johnny Russell

Otis Hopper (uncredited)

Walter Sande

Newspaperman with Pipe (uncredited)

Frank M. Thomas

Hendricks (uncredited)

Harry Strang

Bodyguard (uncredited)

Harry Tenbrook

Bodyguard (uncredited)

Dave Willock

Senate Guard (uncredited)

Lloyd Whitlock

Schultz (uncredited)

John Tyrrell

(uncredited)

Frederick Vroom

Paine's Friend (uncredited)

Layne Tom Jr.

Boy Ranger (uncredited)

Billy Wayne

Reporter (uncredited)

Blanche Payson

Committeewoman (uncredited)

Emma Tansey

Committeewoman (uncredited)

Landers Stevens

Committeeman (uncredited)

William Worthington

Committeeman (uncredited)

Edward Biby

Foreign Diplomat (uncredited)