Darth Vader is a metaphor for who?

From the NYT review of the Revenge of the Sith:

At one point, Darth Vader, already deep in the thrall of the dark side and echoing the words of George W. Bush, hisses at Obi-Wan, “If you’re not with me, you’re my enemy.” Obi-Wan’s response is likely to surface as a bumper sticker during the next election campaign: “Only a Sith thinks in absolutes.”

I seem to recall reading that someone else once said something to the effect of “he who is not for me is against me.”

“I am the Way, the Truth and the Life; no one comes to the Father but by me” strikes me as being more than a little absolutist too.