Pentagon Definitively Debunks Hillary Clinton's Pre-War Claim of Saddam/Al Qaeda Link

An exhaustive Pentagon review has established definitively that there was no pre-war operational link between Saddam Hussein's Iraq and Al Qaeda.

So here's the question for Hillary Clinton. In the senator's war-authorization speech in October 2002, she claimed this:

Saddam "has also given aid, comfort, and sanctuary to terrorists, including Al Qaeda members."

The National Intelligence Estimate at the time cast serious doubts on any Al Qaeda/Iraq link. But Clinton has acknowledged she did not read the NIE.

So what was her source for this faulty intelligence?

And why did Senator Clinton believe it credible enough to use as a linchpin justification for war?