Just as we all remember that famous AP photo of then President George W. Bush first hearing about the 9/11 attacks, so too will we remember this image of counterterrorism official John Brennan briefing President Obama on the details of last month's devastating Sandy Hook Elementary shooting. The photo was released yesterday via the official White House Flickr feed. Reads the picture's caption: "The President later said during a TV interview that this was the worst day of his Presidency."