The duo have an ad campaign made up of social media posts and yard signs mocking Rosetti as a rat and Heidecker briefly confronts him on camera before the D.A.

Heidecker starts to crack under the pressure, excessively drinking and using the TCH vape system that previously addicted him and was responsible for killing the youth at his music festival.

In a drug-induced haze, Heidecker calls Rosetti from the hotel room that doubles as his campaign headquarters and starts out gracefully conceding and offering congratulations before devolving into insults and threats.

Mark Proksch, Jimmy McNichol and Joe Estevez also appear via archive footage The filmmakers preferred using non-actors to elicit genuine responses and the impression of a real documentary film[5] and auditioned around 10 actresses for the part of Toni, on Gregg's recommendation.

[10] In a January 31, 2021, question and answer showing, Heidecker and Notarnicola cited Street Fight, Mitt, Weiner, A Perfect Candidate, and Making a Murderer as inspirations.

The website's critical consensus reads, "Mister America misses a number of its targets, but fans of Tim Heidecker's unique brand of comedy will find moments worth savoring in this dry political satire.

"[15] In The New York Times, Ben Kenigsberg gave the film a mixed review, writing that it has "inspired moments throughout" but "face challenges of momentum", as "Tim's ignorance, insensitivity and ill-fitting tailoring aren't really good for 90 minutes of laughs".

[20] Scott Tobias of NPR also praised the film as a densely-insular series of in-jokes that may not be welcoming to new viewers but "will nonetheless survive as a fascinating artifact of the Trump era, when the rules of politics were revised to give boors and charlatans a pathway to power—even if, like Heidecker, it's only in their own minds.