Well, of course, the terrorists did it and are to blame. However, Clinton had EIGHT YEARS in which to confront the growing islamofascist threat and chose to stick his head firmly up his ass, treating each escalating attack on us as an isolated criminal matter, with no ties to rogue states and/or major international terror groups.
I *do* blame him for anemic "responses" to attacks and for refusing to do anything that might have adversely affected his lofty poll numbers.
As a survivor of the WTC attacks, someone who lost friends and neighbors there, and a resident of one of the neighborhoods immediately outside the WTC site, I consider that gaping hole in the ground to be The Clinton Legacy.