The problem isn't the vague political commentary, which is pretty minimal. It's anti-meat message is stronger.
The problem is there isn't really much to care about here. Mike and his family have minimal personality or background: anybody know what they do for a living or who they are? Why does Mike care so much about seeing the true history come out? Why is it more important to him then his family's safety? Who knows? Who cares?
And isn't it convenient that Mike just happens to know Harkinson, apparently the only person who can perfectly explain the Washingtonians, wants to help, and knows who to contact to get a SWAT team to come in and shoot the bad guys.
Part of the problem is that the director/writers don't know if they're aiming for suspense or comedy. Some of the early scenes with the Washingtonians, decapitating their victim, and outside Amy's window, are fairly creepy. Unfortunately, then the bad guys go blatantly over the top, pounding on the door and drooling around their wooden teeth. Why do these people go out in public dressed this way? How the heck do they maintain a secret society when they go out in public dressed like Revolutionary War soldiers every time someone finds a letter or a femur-fork?
Stripped of Little's original ending, the conclusion doesn't make a lot of sense: how does Harkinson find the feasting lodge? If he knew where it was, why has he been waiting all this time to call down an attack on it? Harkinson is just a deus ex mechina for what's basically a shaggy dog joke. Oh well.