Democratic Congressman Cam Brady (Will Ferrell), representing North Carolina's 14th District of Hammond, is looking to secure his fifth consecutive term without any rivals. However, his seemingly uncontested campaign takes a significant downturn when a scandal erupts; an explicit voice message meant for a supporter accidentally finds its way onto a local family's voicemail, tarnishing Cam's image.
Seizing the moment, the unscrupulous Motch brothers, Glen (John Lithgow) and Wade Motch (Dan Aykroyd), hatch a cunning plan that aims to manipulate the political system. They convince Marty Huggins (Zach Galifianakis](/actor/zach-galifianakis)), the tourism director of Hammond and the son of one of their allies, Raymond Huggins (Brian Cox), to challenge Cam for the Republican nomination. Their ultimate goal is to profit from illicit dealings with Chinese companies, including plans to label "Made in China" goods as "Made in America." Such maneuvers are designed to facilitate large-scale land purchases in Hammond, allowing the Motch brothers to usher in Chinese factory workers, thus bypassing transportation costs while maintaining significant profit margins.
At the outset, Cam scorns Marty, publicly showcasing his ineptitude through a humiliating video biography. In a twist, the Motch brothers engage Tim Wattley (Dylan McDermott) as Marty's campaign manager, transforming Marty into a charismatic business leader and devoted family man. As Marty's campaign gains momentum, Cam's reputation continues to plummet, especially after an unfortunate incident where he inadvertently punches a baby while trying to confront Marty.
In a desperate attempt to regain control, Cam descends into the depths of sleazy politics, branding Marty as an Al Qaeda terrorist. Marty retaliates by revealing Cam's hypocrisy when he fails to recite the Lord's Prayer, thus undermining his facade as a devout Christian. In a misguided bid to revitalize his religious image, Cam visits a snake-handling church only to get bitten, leading to a viral video that unexpectedly boosts his public image.
As the competition heats up, Cam reflects on the negative influence he has had on his son, who is considering slandering a rival for a class position. In a moment of clarity, he seeks to reconcile with Marty, sharing memories of his early political ambitions rooted in altruism, such as removing a perilous rusty slide from a playground. However, the situation takes a turn for the worse when Tim convinces Marty to report Cam’s impaired state, leading to Cam’s arrest.
During a chaotic debate where Cam rants about Marty's supposed "communist manifesto," he inadvertently strikes Uggie the dog from The Artist, further dropping in the polls. As tensions rise, Marty's campaign runs an ad featuring Cam's son calling Marty "dad," leading Cam to retaliate by seducing and recording Marty's neglected wife, Mitzy (Sarah Baker), which humbles the Huggins family and drives Cam’s campaign manager, Mitch (Jason Sudeikis), to desert him. The fighting escalates, culminating in Marty shooting Cam in the leg during a hunting trip, which only boosts Marty's popularity.
With the election looming, Marty confronts the Motch brothers and uncovers their intentions to transfer the land in Hammond to their Chinese partners, threatening American jobs and livelihoods. Realizing he has been a pawn in their game, Marty steps away from their influence and reclaims agency over his campaign. Meanwhile, the Motch brothers slyly shift their allegiance to Cam in hopes of preserving their plans.
As election day arrives, Cam initially appears poised for victory, but Marty’s exposé on the Motch brothers and his commitment to safeguarding Hammond attracts support. Ultimately, despite Cam's apparent win, corruption is revealed as the Motch brothers manipulate voting machines to secure their interests. In a moment of reckoning, Cam reflects on his journey, recalling how he once inspired students by making their playground safer. With a change of heart, he withdraws from the race, unexpectedly paving the way for Marty to seize victory by default.
Months later, a new alliance forms as Cam and Marty team up to expose the corruption of the Motch brothers, leading to a congressional inquiry. Although the brothers argue that their actions are within legal bounds thanks to the Supreme Court's ruling in Citizens United v. Federal Election Commission, they find themselves in hot water for their connections with Wattley, who is revealed to be a notorious international fugitive known as "The Greek Butcher." This unexpected twist leaves the political landscape altered, with Cam and Marty committed to reforming the system and holding the corrupt accountable.
