One of the more frequent rocks thrown at the Bush administration by certain members of our Yellow-Dog peanut gallery is that they ignored or were incapable of understanding obvious signs of the build-up to 9-11. This may or may not be true, but it wouldn't make them the first administration to do so:

More than a year before 9/11, a Pakistani-British man told the FBI an incredible tale: that he had been trained by bin Laden’s followers to hijack airplanes and was now in America to carry out an attack. The FBI questioned him for weeks, but then let him go home, and never followed up. Now, the former al-Qaida insider is talking.

To me it's just another bit of proof nobody was really expecting the attacks. To those who think the death of thousands is a statistic, the reelection of one a tragedy, I doubt it will make any difference at all.