Here's a link to the Superman Homepage. It's a vast website, which I have barely begun to explore. It's got an image gallery that I go back to again and again. Really great and useful stuff. A quick glance reveals that there's something called the Superman Web Ring. Have to check that out further.
it's also got a very brief thread about Obama as Superman, including a picture I hadn't come across yet (also including one of Obama as Green Lantern).