President Obama made a surprise visit to the White House press corps Thursday night, but got agitated when he was faced with a substantive question. Asked how he could reconcile a strict ban on lobbyists in his administration with a Deputy Defense Secretary nominee who lobbied for Raytheon, Obama interrupted with a knowing smile on his face. "Ahh, see," he said, "I came down here to visit. See this is what happens. I can't end up visiting with you guys and shaking hands if I'm going to get grilled every time I come down here." Pressed further by the Politico...