I'm sure John McCain was saving this up, looking for the perfect moment to deploy it. I'm guessing he actually thought it was a good idea to choose the moment of the 4,000th U.S. fatality in Iraq to demand that Hillary Clinton apologize for criticizing General Petraeus and the surge last fall. (Video at the link, from Blogs for John McCain.)
But, of course, he's doing this just at the moment when there's Basra's burning, fighting has spread to Baghdad, the Green Zone is under attack, and the Sadrists' cease-fire may be ending. Oops!
Then again, I'm sure it'll be a matter of minutes before we're told by the press that the renewed fighting in Iraq is very, very good politically for McCain.