corrente

Barton Gellman of WaPo boils it down:

I have not seen a significant factual challenge to the content of Clarke's book.
(via WaPo)

There you have it, folks! And, oh yeah, it wasn't The Clenis™:

[Clarke's] criticisms of Clinton are milder, mainly that Clinton stopped short of maximum effort. He generally describes that as a product of constraints Clinton couldn't overcome, including his political weakness in the last two years of the presidency.

He says Clinton did make terrorism a top priority, and it's clear that Clinton's national security cabinet was deeply, even consumingly, engaged in the problem. The Bush administration had different priorities, and the issue worked over eight months through middle and upper middle levels of the bureaucracy.