James Pinkerton at Newsday says that George Lucas is looking for something with Episode III:

The politics of the “Star Wars” movies have twisted around for the past three decades, but now, in the final episode, director-creator George Lucas has made a bid for critical acclaim – even if it costs him commercial success.

But that’s OK. Lucas, now in his seventh decade, has his billions. What he needs now is absolution for past sins of political incorrectness.

I dunno. I liked John’s interpretation better.