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

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)

Frederick Burton

Senator Dearhorn (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)