It's very obvious that none of these people have actually *read* the New Yorker. The very essence of the magazine is a thinly-veiled, faintly amused, oh-look-at-the-little-people-scream style of ironic commentary. As such, a cover parodying the caricature of the Obamas that's being painted by the mainstream news is entirely appropriate. In fact, I think it's quite funny. I must admit, though, that I do occasionally have an ironic and *gasp* elitist sense of humor.
Of course, that which is being parodied (or that whose parody is being parodied) is practically never capable of recognizing what's actually going on, and so will misunderstand the entire thing and scream bloody murder, because, guess what, they are not the target audience of the New Yorker! Seriously, this is like people getting upset because the cover of Cosmo features a sexy woman in makeup.
Personally, my guess would be that Obama *does* get it, but because of the furor can't afford to actually admit it. He's already taken a lot of big chances in calling things what they are (like his response to the Rev. Wright flap) but like anyone else he needs to pick his battles. This is so appallingly inconsequential that yes, his campaign (not him personally, note) is issuing the expected Shock and Condemnation so that people will Move the Fuck On Already.
So yeah. Move the Fuck On Already.