• 
  Frank Capra

  regizor

• 
  Jean Arthur

  Clarissa Saunders
• 
  James Stewart

  Jefferson Smith
• 
  Eric Mayne

  Man in Senate Building
• 
  William Arnold

  Reporter
• 
  Billy Watson (II)

  Peter Hopper
• 
  Larry Steers

  Committeeman
• 
  Jack Low

  Hoodlum

• 
  Harry Carey

  Henry - President of the Senate
• 
  Erville Alderson

  Handwriting Expert
• 
  Craig Stevens

  Senate Reporter
• 
  Blanche Payson

  Committeewoman
• 
  Fred 'Snowflake' Toones

  hamal
• 
  Olaf Hytten

  Majordom
• 
  Grant Mitchell

  Senator MacPherson

• 
  Georgia Caine

  Third Radio Speaker
• 
  Nick Copeland

  Senate Reporter
• 
  Frank Puglia

  Handwriting Expert
• 
  Beulah Bondi

  Ma Smith
• 
  Ann Doran

  Paine's Secretary
• 
  Edward Arnold

  Jim Taylor
• 
  Eugene Pallette

  Chick McGann
• 
  Porter Hall

  Senator Martin Monroe
• 
  Joe Devlin

  Chelner
• 
  Edmund Cobb

  Senator Gower
• 
  Frederick Vroom

  Paine's Friend
• 
  Edward Earle

  Reporter
• 
  Dave Willock

  Senate Guard
• 
  Eddie Kane

  Reporter
• 
  Lynton Brent

  Fotograf
• 
  Lorna Gray

  Woman at Station
• 
  Gino Corrado

  Barber
• 
  Vernon Dent

  Senate Reporter
• 
  Dick Elliott

  Carl Cook
• 
  Matt McHugh

  Reporter
• 
  Eddie Fetherston

  Senate Reporter
• 
  Alec Craig

  Speaker
• 
  Jack Richardson

  Senator Manchester
• 
  Anne Cornwall

  Senate Reporter
• 
  Guy Kibbee

  Governor Huber Hopper
• 
  Claude Rains

  Senator Joseph Harrison Paine
• 
  Frank Austin

  Inventor at Smith's Office Door
• 
  Byron Foulger

  Hopper's Secretary
• 
  Chester Conklin

  Man in Press Section of Senate Gallery
• 
  Lloyd Ingraham

  Committeeman
• 
  Stanley Andrews

  Senator Hodges
• 
  Dickie Jones

  Pageboy Richard Jones
• 
  Louis Jean Heydt

  Soapbox Speaker
• 
  Carl Stockdale

  Senator Burdette
• 
  Russell Simpson

  Kenneth Allen
• 
  Harry C. Bradley

  Arthur Kim
• 
  Dorothy Comingore

  Woman at Station
• 
  James Millican

  Senate Reporter
• 
  Robert Sterling

  Rol neidentificat
• 
  Astrid Allwyn

  Susan Paine
• 
  Harry A. Bailey

  Senator Hammett
• 
  Charles Lane

  Nosey
• 
  Ruth Donnelly

  Emma Hopper
• 
  Frederick Burton

  Senator Dearhorn
• 
  George Cooper

  Chelner
• 
  Eddy Chandler

  Reporter
• 
  Wade Boteler

  Family Man
• 
  Pierre Watkin

  Senator Barnes - Senate Minority Leader
• 
  Mary Gordon

  Woman
• 
  Brooks Benedict

  Senate Clerk
• 
  Douglas Evans

  Francis Scott Key
• 
  H.B. Warner

  Senator Agnew - Senate Majority Leader
• 
  Dub Taylor

  Reporter
• 
  Jack Carson

  Sweeney Farrell - Newsman
• 
  William Worthington

  Committeeman
• 
  Vera Lewis

  Mrs. Edwards
• 
  Billy Wayne

  Reporter
• 
  Gene Morgan

  Reporter
• 
  Georgie Cooper

  Committeewoman
• 
  Lew Davis

  Senate Clerk
• 
  William Demarest

  Bill Griffith
• 
  H.V. Kaltenborn

  Himself
• 
  Thomas Mitchell

  Diz Moore