I'm going to see it just to piss Brass off. After that I'll text a donation to Romney and another to the NRA in Brass' honor. And yes, I will take my Ruger LCP to the theatre in case there is some rapid Canadian leftist there.
All political documentaries are biased. It's the only way they can get financed. The people who put up the money for production and distribution want to know there's a base audience out there that will go see the movie. Movies make money by telling people what they want to hear. Fiction movies send us messages like "good conquers evil" and "persistance wins the day" because that's what we want to hear. Documentaries are no different. They target an audience and tell them what they want to hear. It's the nature of the business.