Frank Capra Director, Producer James Stewart Jefferson Smith Actor Jean Arthur Clarissa Saunders Actor Claude Rains Sen. Joseph Harrison Paine Actor Edward Arnold Jim Taylor Actor Guy Kibbee Gov. Hubert "Happy" Hopper Actor Thomas Mitchell Diz Moore Actor Eugene Pallette Chick McGann Actor Beulah Bondi Ma Smith Actor H.B. Warner Sen. Agnew Actor Harry Carey President of the Senate Actor Astrid Allwyn Susan Paine Actor Ruth Donnelly Emma Hopper Actor Grant Mitchell Sen. MacPherson Actor Porter Hall Sen. Monroe Actor Pierre Watkin Sen. Barnes Actor Charles Lane Nosey newsman Actor William Demarest Bill Griffith Actor Dick Elliott Carl Cook Actor Jack Carson Sweeney Farrell (uncredited) Actor Joseph King Summers (uncredited) Actor Paul Stanton Flood (uncredited) Actor Russell Simpson Kenneth Allen (uncredited) Actor Stanley Andrews Sen. Hodges (uncredited) Actor Walter Soderling Sen. Pickett (uncredited) Actor Vera Lewis Mrs. Edwards (uncredited) Actor Dora Clement Mrs. McGann (uncredited) Actor Lewis R. Foster Writer Sidney Buchman Writer Dimitri Tiomkin Original Music Joseph Walker Cinematographer Al Clark Film Editing Gene Havlick Film Editing Lionel Banks Art Director Robert Kalloch Costume Design