Except for what appears—thank God—to be only a minor injury to a Secret Service officer who was shot near a security checkpoint, no one was hurt at the White House Correspondents’ Association dinner last night. News reports are reassembling the mosaic of the attacker’s movements; he apparently took a train and transported some weapons with him, checked into the hotel, and then made his run at the event. These are the basic contours of all that we know, and it will take time for more credible