The Phantom President

The Phantom President is a 1932 American PreCode musical comedypolitical satire film directed by Norman Taurog, and starring George M. Cohan, Claudette Colbert and Jimmy Durante.

It tells the fictional story of American presidential candidates, based on the novel by George F. Worts. A colorless stiff candidate for President is replaced in public appearances by a charismatic medicine show pitchman.

Source: Wikipedia