It's rare that a low-budget documentary becomes a genuine blockbuster, but conservative firebrand Dinesh D'Souza's controversial new film, "2016: Obama's America," is one of the hottest tickets at the box office right now. "I'm overwhelmed," D'Souza said. "This is my first venture into film territory." The film is now showing in more than 1,000 theaters, and that number is expected to double by Friday, which would put the movie's release on par with a major Hollywood blockbuster. Last weekend, "2016" was already earning more money per screen than "The Bourne Legacy" and "The Expendables 2" -- combined. The film has...