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To paraphrase Roger Ebert, a piece of writing isn't about what it's about, it's about how it's about it. This was joyous, celebratory, and funny. God forbid such attitudes would perish from Salon in the service of such self-serious offense by proxy.
And by that I mean, from what is known about the Obamas, what do you think their reaction to this would be? If you answered anything but "a good laugh", I submit you haven't been paying enough attention to their self-possession.
Here's another paraphrase -- as Rob Halford would say, I'm offended by your offendability.