They don't blame W for pre-911, just for not cleaning house afterwards...
"There are two charges that can be legitimately leveled against
George W. Bush. The first is that, in spite of knowing that the
Clinton policy on Iraq was ineffective, he neither ended the
containment of Hussein nor moved to destroy him. Bush carried on
Clinton's policies unchanged. The second charge is that Bush did
not increase the level of effort taken to destroy al Qaeda, but
essentially followed the Clinton administration's policy of
watching and hoping for a low-risk, low-cost moment to act -- a
moment that Osama bin Laden was too smart to give them.
In our view, the most serious charge that can be made against
Bush is not that he continued -- unchanged -- key Clinton
policies before Sept. 11, but that he did not drastically reshape
his administration for war after Sept. 11. He left in place the
man who was responsible for the failure to understand, locate and
destroy al Qaeda under President Bill Clinton and inexplicably
left him and others in place, even after his failures became
manifest on -- and after -- Sept. 11.
This was, in our view, a serious error in judgment. It may be an
unforgivable one. But to hold Bush's eight months in office as
having been more responsible for al Qaeda's emergence than
Clinton's eight years in office -- not to mention the Carter and
Reagan administrations' responsibility for encouraging militant
Islam -- strikes us as strange reasoning."