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)

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)

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)

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)

Dora Clement
Mrs. McGann (uncredited)

Harry C. Bradley
Arthur Kim (uncredited)

Lynton Brent
Photographer (uncredited)

Harlan Briggs
Mr. Edwards (uncredited)

Harry Burkhardt
Senate Reporter (uncredited)

Georgia Caine
Third Radio Speaker (uncredited)

Ken Carpenter
Announcer (uncredited)

Eddy Chandler
Reporter (uncredited)

Davison Clark
Committeeman (uncredited)

Alec Craig
Speaker (uncredited)

Anne Cornwall
Senate Reporter (uncredited)

George Cooper
Waiter (uncredited)

Jack Cooper
Photographer (uncredited)

Vernon Dent
Senate Reporter (uncredited)

Maurice Costello
Diggs (uncredited)

Harry Depp
Hat Salesman / Secretary (uncredited)

Byron Foulger
Hopper's Secretary (uncredited)

Helen Jerome Eddy
Paine's Secretary (uncredited)

John Dilson
Secretary (uncredited)

Lester Dorr
Taylor's Stooge (uncredited)

Robert Dudley
Reporter (uncredited)

Edward Earle
Reporter (uncredited)

Jack Egan
Reporter (uncredited)

Eddie Fetherston
Senate Reporter (uncredited)

Mabel Forrest
Senate Reporter (uncredited)

Gladys Gale
Committeewoman (uncredited)

Mary Gordon
Woman (uncredited)

June Gittelson
Woman at Station (uncredited)

Lorna Gray
Woman at Station (uncredited)

Harry Hayden
First Radio Announcer (uncredited)

Louis Jean Heydt
Soapbox Speaker (uncredited)

John Ince
Senator Fernwick (uncredited)

Philo McCullough
Senator Albert (uncredited)

Henry Hebert
Senator (uncredited)

Philip Hurlic
Boy Ranger (uncredited)

Olaf Hytten
Butler (uncredited)

Lloyd Ingraham
Committeeman (uncredited)

Mitchell Ingraham
(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)

Jack Lindquist
Chorus Member (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)

George McKay
Reporter (uncredited)

Lafe McKee
Veteran at Lincoln Memorial (uncredited)

Ben Taggart
Pompous Man (uncredited)

Wilfred Lucas
Pompous Man (uncredited)

Sammy McKim
Boy Ranger (uncredited)

William Newell
Reporter (uncredited)

Robert Middlemass
Radio Announcer #2 (uncredited)

James Millican
Senate Reporter (uncredited)

Howard M. Mitchell
Shoe Salesman (uncredited)

Charles R. Moore
Porter (uncredited)

Gene Morgan
Reporter (uncredited)

Frank O'Connor
Senator Alfred (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)

Victor Travis
Senator Grainger (uncredited)

Carl Stockdale
Senator Burdette (uncredited)

Bob Walker
Senator Holland (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)

Charles Sullivan
Cab Driver (uncredited)

Layne Tom Jr.
Boy Ranger (uncredited)

Billy Wayne
Reporter (uncredited)

John Ward
Photographer (uncredited)

Blanche Payson
Committeewoman (uncredited)

Florence Wix
Committeewoman (uncredited)

Jesse Graves
Black Committeeman (uncredited)

Larry Steers
Committeeman (uncredited)

Landers Stevens
Committeeman (uncredited)

William Worthington
Committeeman (uncredited)

Frank McLure
Senator (uncredited)