But the most stunning exchange of the day came on a question from Republican John Warner, one of the Senate's elder statesmen on military matters. The Chicago Tribune reported:

Warner concluded with a question: "Are you able to say at this time, if we continue what you have laid before the Congress here as a strategy, do you feel that that is making America safer?"

Petraeus said the strategy was the best course for achieving U.S. objectives in Iraq.

"Does that make America safer?" pushed Warner.

Said Petraeus, "Sir, I don't know, actually. I have not sat down and sorted it out in my own mind."

Petraeus' response to one of the most fundamental questions for the American people about the war in Iraq—does this war make us safer—was "I don't know." Every day, young Americans are being asked to risk and give their lives for a policy that the commanding general can't say is making America safer. Extraordinary.