Not only is it a one-joke characterization, the joke is on the level of a below-average knock-knock joke.
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"The Undefeated" is a documentary about Sarah Palin made by and for the faithful, who may experience it in the way believers sit through a rather boring church service. At nearly two hours, it's a campaign advertisement in search of a campaign.
But that's not surprising. What astonished me is that the primary targets in the film are conservative Republicans. Yes, there are the usual vague references to liberals and elitists (although I heard the word "Democrat" only twice). But the film's favorite bad guys seem to be in the GOP establishment. This seems odd, considering that the target audience is presumably Republicans.