Willie Nelson has joined the cast of a new movie, Swing Vote, for Touchstone Pictures. The comedy tells the story of a presidential election that comes down to one vote -- which will be cast by a father named Bud Johnson (Kevin Costner). The cast also includes Paula Patton, Kelsey Grammer, Dennis Hopper, Nathan Lane, Stanley Tucci, George Lopez, Judge Reinhold, Mare Winningham and Richard Petty. The film is being produced by Costner's production company, Treehouse Films. Production began in July in Albuquerque, N.M.