January 20, 2010 4:02 pm First Lady Surprises White House Tour Group Michelle Obama greeted White House visitors to mark the end of her family’s first year at 1600 Penn. Local 2:15 Veteran of wars in Iraq, Afghanistan killed in Laurel hit-and-run 3:28 Social media and teens' mental health: A psychiatrist weighs in 1:41 DC-area police ramp up traffic enforcement in pedestrian safety campaign 3:05 ‘We need real liberation': George Washington University pro-Palestinian protest enters fifth day 2:17 GW asks to students to move pro-Palestinian demonstration