GEORGE W BUSH: The man ultimately responsible for what may prove America's greatest ever foreign policy blunder. Almost certainly, Bush made up his mind to attack Iraq by mid-2002 at the latest. The reasons are still not clear. Was it Saddam's imagined weapons of mass destruction? Oil? The neocon conceit that democracy could be imposed by force? Or a desire to prove his father wrong for not toppling Saddam in 1991? Probably a mixture of all the above. Bush's high point was the "mission accomplished" moment on a US carrier in May 2003. His popularity has since ebbed to near-record lows. His 2007 troop surge has worked up to a point, but a lasting solution in Iraq is far off. Stubborn, incurious, Bush cannot admit that the biggest beneficiary of the mess is his arch foe Iran. He will surely go down as one of the worst US presidents ever, if not the worst.