The film grossed $1.2 million for the day, according to preliminary estimates, bested only by "The Expendables 2."
As Republicans gathered in Tampa, Fla., for the GOP convention, conservative documentary 2016: Obama's America rocketed to No. 2 at the domestic box office Monday.
Obama's America grossed an estimated $1.2 million for the day from 1,091 theaters, dropping a narrow 37 percent from Sunday. Most films dropped 60 percent or more.
The film, based on Dinesh D’Souza book, now has grossed $10.5 million to become the No. 6 political documentary of all time and the top conservative doc. It's also the top documentary of 2012, excluding nature films.
Monday's number could come in slightly lower or higher once final numbers are released. Obama's America came in No. 7 for the weekend with a hearty gross of $6.5 million.
Lionsgate and Millennium Films' The Expendables 2 continued to top the box office Monday, grossing an estimated $1.4 million.
Obama's America, co-directed by D'Souza and John Sullivan, is planning another major expansion that will push its theater count past 1,800 in the coming days.
"Screens are being added on an hourly basis in response to demand," said Mark Joseph of MJM Entertainment, which is helping to market the film. "Our job over the last six months was to create interest in the film. The rest is up to the people. Ultimately, they'll decide the screen count."
Obama's America -- promoted heavily on talk radio and distributed by Rocky Mountain Pictures -- timed its nationwide expansion Friday to the Republican National Convention, which officially gets underway Tuesday after a one-day weather delay due to Tropical Storm Isaac.