The ad is racist because it insinuates that the Messiah cannot be black.
Besides knocking the Lamb of Chicago for his presumptuousness (racist attack) and arrogance (racist attack) and narcissism (racist attack), it also might usefully piss off some religious voters, because, in all seriousness, Obama's semi-serious belief that he is sent by a Higher Power to grant us Salvation does have a bit of blasphemous edge to it. (Racist attack.)
How serious is that last bit? I have no idea. I don't know how seriously to take Obama's messianic posturing. I don't know how seriously he takes it. And I don't know how seriously annoyed a religious person might be by it.
It is there, though. I don't believe Obama thinks he's Christ, and I don't think anyone believes Obama believes he's Christ, either. But his basic message of holy transcendence through his power and his glory does seem to be one that competes, however vaguely, with actual religion.
Surely his cultists are not so enthused by his energy policy. No, they are dreaming of something bigger, something metaphysical. Perhaps not re-born into bodies incorruptible, but at the very least they expect some degree of expiation for their (and of course their nation's) sins.
His narrative is about redemption, first and foremost. And I do believe that spiritual space is filled, for many, by more established figures and better-tested metaphysics.