This is evidently a play on the term "reservation Indian," denoting the harmless, domesticated breed (e.g., David Brooks) as opposed to us buck-wild conservatives who are prone to guzzling constitutional firewater and taking some liberal scalps.
To me, Brooks is more of a Gimp Boy Conservative. Open the box, bring out the gimp, let him say a few things as a token conservative and back in the box he goes. Brooks is getting way too use to being in the box.
(The following clip is only the movie still and a selection from the soundtrack -- Safe for work.)