I vote for L. B. Johnson as the worst president by far.
Interesting that the most popular bad presidents seem to be since the first World War. I already mentioned Grant, and somebody else did, too. Grant could have cleaned up the Land Office and introduced some kind of control over the growing corporations so that socialism would never have gotten a foothold. Golden opportunity, the man in the right place at the right time, but he let it all slide.
I agree from a fiscal perspective.
From a national integrity angle, Scumbag has no peers. There never was and never will be any president that will top the scum meter record that Scumbag set.
Unless, of course, Scumbagette gets elected in 2008.