FDR-Franklin Delano Roosevelt
The best president ever, to do what he did takes something inside, few if any presidents have what it takes to be the man he was.
If you say either of the Bush's are anything other than, well mediocre I find you at fault because that's all they are, Reagan on the otherhand was a good president, although he had little effect upon the shround of Communism falling.
The first President Bush was good but his son was the worst thing to happen to this country, he's failed at every business he's had like Truman, but Truman was successful as president and Bush is well, not that good.