George Bush -- Worst President Ever?

So says this article by Richard Reeves, the apparent result of a poll of 415 historians, with 338 of those believing the President is failing in his duties. While I agree with many of the critiques listed in the article, it's not too hard to list other presidents who were worse -- Martin Van Buren, perhaps? Chester A. Arthur? Carter? Ford? Hoover? Andrew Johnson? I'm no fan of the President, but let's be reasonable. First, it seems unfair to rate a presidency before it's over. Second, we won't have a full understanding of the hows and whys of the Bush presidency until administration documents have all been made public, and we have some benefit of hindsight to see how things play out. Third, I say again, Chester A. Arthur? The guy's biggest accomplishment wasn't even his -- it was the Statute of Liberty, which was a gift from France...