The article was a general puff piece. It didn't require that particular image, just any old photo of Obama, which makes it all the more interesting that that photo was chosen.
Just three weeks into his presidency Obama has already been so mythologized that we hardly notice when he's given a halo. As with most depictions of Christ from a certain era, it's become a routine visual accessory.
Before the presidential seal became his backdrop, the Obama campaign logo was used for similar effect. A quick Google image search for "Obama Halo" turned up almost half a million images, many with links to rather bizarre citations. (Sorry for the lack of credits. They were difficult to trace)
Am I the only one worried that we may be burdening our president with impossible expectations? After all, look what happened the last time we anointed a holy man as our leader.