The alcoholic middle-aged uncle Bud (Kevin Costner) has just been fired for being drunk. He spends his day playing and has no interest in family, state, and world affairs. However, he has a smart, precocious, and highly assertive 12-year-old daughter Molly (Madeline Carroll). Seeing that the U.S. election is approaching, judging from Bard's experience in the first half of his life, this matter has nothing to do with him, because he has no understanding of voter qualifications and has never registered. However, this year, Molly had quietly helped him complete all his applications with a flick of his finger. However, what was even more unexpected was that due to a malfunction of the voting machine, Bud's vote turned into a key vote in determining the outcome of the U.S. presidential election. For a time, various media and candidate teams flocked to the scene, and Bard and his daughter were pushed to the forefront of the storm. How will Bard, a small citizen who has never been involved in politics, face and judge this sudden situation, and how will he cast his key vote?