Swing Vote (2008)

"Swing Vote" follows the story of Bud Johnson (Kevin Costner), an apathetic, beer-slinging, lovable loser, who is coasting through a life that has passed him by. The one bright spot is his precocious, over-achieving twelve-year-old daughter Molly. She takes care of both of them, until one mischievous moment on Election Day, when she accidentally sets off a chain of events which culminates in the election coming down to one vote... her dad's.

"Swing Vote" is a comical look at the journey of one father and daughter who discover that everyone has the power to change the world.