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| James Stewart | Jefferson Smith |
| Jean Arthur | Clarissa Saunders |
| Claude Rains | Sen. Joseph Harrison Paine |
| Edward Arnold | Jim Taylor |
| Guy Kibbee | Gov. Hubert ``Happy'' Hopper |
| Thomas Mitchell | Diz Moore |
| Eugene Pallette | Chick McGann |
| Beulah Bondi | Ma Smith |
| H.B. Warner | Sen. Agnew |
| Harry Carey | President of the Senate |
| Astrid Allwyn | Susan Paine |
| Ruth Donnelly | Emma Hopper |
| Grant Mitchell | Sen. MacPherson |
| Porter Hall | Sen. Monroe |
| Pierre Watkin | Sen. Barnes |
| Charles Lane | Nosey newsman |
| William Demarest | Bill Griffith |
| Dick Elliott | Carl Cook |
| Jack Carson | Sweeney Farrell (uncredited) |
| Joe King | Summers (uncredited) |
| Paul Stanton | Flood (uncredited) |
| Russell Simpson | Kenneth Allen (uncredited) |
| Stanley Andrews | Sen. Hodges (uncredited) |
| Walter Soderling | Sen. Pickett (uncredited) |
| Vera Lewis | Mrs. Edwards (uncredited) |
| Dora Clement | Mrs. McGann (uncredited) |
A country bumpkin faces ridicule and corruption when he takes his idealistic views to the nation's capital.
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