戴夫·柯维在长相上酷似新任美国总统米切尔。一天,米切尔在与女秘做爱时,突然中风,昏迷不醒。白宫幕僚长鲍勃让戴夫冒统总统,以伺机夺位。谁知在戴夫当总统期间,勤政爱民,大力推动改革法案,鲍勃盛怒之下,揭发米切尔政府贪污内幕。戴夫为保荐副总统顺利接任,在议会上演出了一幕最精彩的中风……Bill Mitchell is the philandering and distant President of the United States. Dave Kovic is a sweet-natured and caring Temp Agency operator, who by a staggering coincidence looks exactly like the President. As such, when Mitchell wants to escape an official luncheon, the Secret Service hires Dave to stand in for him. Unfortunately, Mitchell suffers a severe stroke whilst having sex with one of his aides, and Dave finds himself stuck in the role indefinitely. The corrupt and manipulative Chief of Staff, Bob Alexander, plans to use Dave to elevate himself to the White House - but unfortunately, he doesn't count on Dave enjoying himself in office, using his luck to make the country a better place, and falling in love with the beautiful First Lady...