Calderon State Visit

U.S. President Barack Obama and Mexican President Felipe Calderon walk towards the White House during an official state arrival on the South Lawn with U.S. First Lady Michelle Obama and Margarita Zavala

Neil Armstrong

Neil Armstrong, retired astronaut and commander of the Apollo 11 mission, listens during a Senate Commerce, Science and Transportation Committee hearing on the future of United States human space flight in Washington

White House Correspondents' Association Dinner