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Mr. Bossie ended up connecting with a couple of Hollywood conservatives, actor Ron Silver and screenwriter Lionel Chetwynd, and released “Celsius 41.11: The Truth Behind the Lies of ‘Fahrenheit 9/11’” in 2004. The documentary did well enough that Mr. Bossie went on to make “Hillary: The Movie” in 2007 about Democratic presidential candidate Hillary Rodham Clinton, which became the basis for the 2010 Supreme Court case Citizens United v. the Federal Election Commission.

Elsewhere, other conservatives were jumping into the documentary field. “Waiting for Superman,” a critique of the public-education system by Davis Guggenheim, grossed more than $6 million in 2010, while “Expelled,” Ben Stein’s film about the teaching of evolution and intelligent design, grossed $7.7 million in 2008.

“Michael Moore changed the world in that regard,” Mr. Medved said. “It’s because of Michael Moore and his success that a whole generation of children want to be documentarians, and some of them are conservative.”

What annoys Mr. Medved is that the Academy Awards never acknowledges right-leaning documentaries. “The only films that get recognition are left-wing films. Everything else goes straight to the trash can,” he said.

Don’t expect “2016: Obama’s America” to change that trend. Only three of 14 “major critics” listed on the Rotten Tomatoes website gave the film a positive review, with reviewers describing it as everything from “a vicious, larger-than-life racist lie” to “deeply boring.” On the other hand, 77 percent of moviegoers gave it a positive rating.

“There is a huge market that is not being well-served by Hollywood. If conservatives can make high quality films that are entertaining and informative then there is a lot of opportunity out there,” Mr. D'Souza said.