CHICAGO, IL - FEBRUARY 08: Known and Unknown: A Memoir by former U.S. Defense Secretary Donald Rumsfeld is offered for sale at a Barnes & Noble bookstore on February 8, 2011 in Chicago, Illinois. The... more 
CHICAGO, IL - FEBRUARY 08: Known and Unknown: A Memoir by former U.S. Defense Secretary Donald Rumsfeld is offered for sale at a Barnes & Noble bookstore on February 8, 2011 in Chicago, Illinois. The book chronicles Rumsfeld's career in politics and the private sector. (Photo by Scott Olson/Getty Images) less 
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Getty Images | Photo By Scott Olson / Getty Images
Tue, Feb 8, 2011 6:24 PM EST