"Known known": Rumsfeld fixated on Iraq from 9/12/01?

In a well-documented take-down of Donald Rumsfeld's memoir Known Unknowns, Bob Woodward uses records from his own interviews and George W. Bush's Decision Points to dispute Rumsfeld's claim that Bush asked him to look at  then-current military plans for invading Iraq shortly after 9/11 -- on 9/26/01, to be exact. Woodward, offended that Rumsfeld "tries to push so much off on Bush", is at pains to demonstrate that Rumsfeld himself was floating the idea of invading Iraq on 9/11 and 9/12 -- and that "the record shows that it was Rumsfeld stoking the Iraq fires" before Bush did indeed ask for plans in late November. 

Woodward's evidence is from his own Plan of Attack and from the 9/11 Commission Report.  Former counterterrorism director Richard A. Clarke's Against All Enemies provides corroboration that Rumsfeld was fixated on Iraq from the beginning. Clarke implies that driving Rumsfeld's focus was Wolfowitz:

On the morning of the 12th DOD's focus was already beginning to shift from al Qaeda. CIA was explicit now that al Qaeda was guilty of the attacks, but Paul Wolfowitz, Rumsfeld's deputy, was not yet persuaded. It was too sophisticated and complicated an operation, he said, for a terrorist group to have pulled off by itself, without a state sponsor--Iraq must have been helping them...

By the afternoon on Wednesday, Secretary Rumsfeld was talking about broadening the objectives of our response and "getting Iraq."  Secretary Powell pushed back, urging a focus on al Qaeda...