Mr. Smith Goes to Washington is a 1939 American political comedy-drama film directed by Frank Capra, starring Jean Arthur and James Stewart, and featuring Claude Rains and Edward Arnold. The film is about a naive, newly appointed United States senator who fights against government corruption, and was written by Sidney Buchman, based on Lewis R. Foster's unpublished story "The Gentleman from Montana". It was loosely based on the life of Montana US Senator Burton K. Wheeler, who underwent a similar experience when he was investigating the Warren G. Harding administration's Teapot Dome scandal.

Plot

In the late 1930s, the governor of an unnamed western state, Hubert "Happy" Hopper, appoints Jefferson Smith to replace deceased U.S. Senator Sam Foley. Smith is head of the Boy Rangers, and his appointment is supported by the governor's children. Corrupt political boss Jim Taylor sought the appointment of his handpicked stooge, while popular committees wanted another candidate. Smith, however, was chosen because his naivety about politics was expected to make him easy to manipulate.