Secretary of Defense Donald Rumsfeld is an accomplished man. Not only is he guiding the war in Iraq, he has been a pilot, a congressman, an ambassador, a businessman, and a civil servant. But few Americans know that he is also a poet.

http://slate.msn.com/id/2081042

The Unknown
As we know,
There are known knowns.
There are things we know we know.
We also know
There are known unknowns.
That is to say
We know there are some things
We do not know.
But there are also unknown unknowns,
The ones we don't know
We don't know.

—Feb. 12, 2002, Department of Defense news briefing

go to the link, and do a "find" on the word know. Youd be surpriced. I think he has a know fetish