The Great Accident(1920)

Winthrop Chase is running for mayor on the prohibition ticket in a town where his irresponsible son Wint is infamous for his drunken sprees. Wint is in love with Joan Caretall, whose father Amos is a big political boss. Amos fears Winthrop's power and decides to stalemate him by substituting Wint's name on the ballot for that of his father. The morning after the election, Wint awakens from a drunken stupor and finds himself the mayor.