President Barack Obama answers questions during a news conference at the conclusion of the Nuclear Security Summit in Washington, Tuesday, April 13, 2010.
U.S. President Barack Obama (C) speaks to Germany’s Chancellor Angela Merkel (L) and Singapore’s Prime Minister Lee Hsien Loong during the first plenary session at the Nuclear Security Summit in Washington, April 13, 2010.
U.S. President Barack Obama (C) talks with Kazakhstan’s President Nursultan Nazarbayev (L) as Jordan’s King Abdullah II bin Hussein listens during the group photo at the Nuclear Security Summit 2010 in Washington, April 13, 2010. Behind them are (L-R) South Africa’s President Jacob Zuma, Russia’s President Dmitry Medvedev and Switzerland’s President Doris Leuthard.
President Barack Obama talks with Spanish Prime Minister Jose Luis Rodriguez Zapatero during the opening plenary session of Nuclear Security Summit in Washington, Tuesday, April 13, 2010.
President Barack Obama delivers opening remarks to the participating members of the Nuclear Security Summit at the Plenary Session, in Washington, Tuesday, April 13, 2010.
U.S. President Barack Obama speaks during the first plenary session at the Nuclear Security Summit in Washington, April 13, 2010.
President Barack Obama talks with Vice President Joe Biden during the opening plenary session of Nuclear Security Summit in Washington, Tuesday, April 13, 2010.
President Barack Obama talks with South Korean President Lee Myung-bak, left, during the opening plenary session of the Nuclear Security Summit in Washington, Tuesday, April 13, 2010.
President Barack Obama talks with Argentine President Cristina Fernandez during the opening plenary session of the Nuclear Security Summit in Washington, Tuesday, April 13, 2010
U.S. President Barack Obama (3rd L) walks to his limousine after stepping off Air Force One at Miami International Airport in Miami, Florida, April 15, 2010.
President Barack Obama walks to the SpaceX Falcon 9 launch vehicle with Elon Musk, of SpaceX, Thursday, April 15, 2010, at Kennedy Space Center, Fla.
President Barack Obama walks away from the SpaceX Falcon 9 launch vehicle with Elon Musk, of SpaceX, right, Thursday, April 15,, 2010, at Kennedy Space Center, Fla.
U.S. President Barack Obama greets military personnel before boarding Air Force One at Andrews Air Force Base near Washington, April 15, 2010.
U.S. President Barack Obama (R) greets military personnel before boarding Air Force One at Andrews Air Force Base near Washington, April 15, 2010.
President Barack Obama walks with Air Force Col. Steven M. Shepro, after arriving at Andrews Air Force Base, Md., Thursday, April 15, 2010, prior to traveling to Florida.
U.S. President Barack Obama (C) walks with astronaut Buzz Aldrin (3rd L) to board Air Force One at Andrews Air Force Base near Washington, April 15, 2010.
President Barack Obama speaks at a Democratic National Committee fundraiser at the Arsht Center for the Performing Arts in Miami, Thursday, April 15, 2010.
U.S. President Barack Obama attends a DNC fundraiser at the Arsht Center for the Performing Arts in Miami, Florida April 15, 2010.
President Barack Obama speaks at a Democratic National Committee fundraiser at the Arsht Center for the Performing Arts in Miami, Thursday, April 15, 2010.
President Barack Obama attends the opening session of the Space Conference at NASA Operations and Checkout Building in Cape Canaveral, Florida, April 15, 2010.
President Barack Obama speaks at Kennedy Space Center, Fla., Thursday, April 15, 2010.
US President Barack Obama walks past a main engine of a space shuttle as he arrives to speak at Kennedy Space Center in Cape Canaveral, Florida. Obama said Thursday he is aiming to send US astronauts into Mars orbit in the mid-2030s as he sought to quell protests over his earlier space policies.
U.S. President Barack Obama delivers remarks at the opening session of the Space Conference at NASA Operations and Checkout Building in Cape Canaveral, Florida, April 15, 2010.
President Barack Obama walks down the stairs of Air Force One as he arrives at Andrews Air Force Base, Md., Thursday, April 15, 2010.
President Barack Obama arrives in the Rose Garden of the White House in Washington, Thursday, April 15, 2010, to talk about mine safety. With him, from left are, Mine Safety and Health Administrator Kevin Stricklin; Labor Secretary Hilda Solis and Assistant Secretary of Labor for Mine Safety and Health Joe Main.
President Barack Obama delivers a statement on mine safety, Thursday, April 15, 2010, in the Rose Garden of the White House in Washington. Joining him, from left are, U.S. Mine Safety and Health Administrator Kevin Stricklin, Labor Secretary Hilda Solis, and United Mine Workers of America safety director Joe Main.
President Barack Obama speaks during a meeting of the President’s Economic Recovery Advisory Board, Friday, April 16, 2010, in the Roosevelt Room of the White House in Washington. From second from left are, are Commerce Secretary Gary Locke, Vice President Joe Biden, the president, and White House adviser Paul Volcker.
President Barack Obama signs a memorandum establishing the Great Outdoors Initiative, Friday, April 16, 2010, at the White House Conference on America’s Great Outdoors, at the Interior Department in Washington. Behind the president, from left are, Environmental Protection Agency Administrator Lisa Jackson, Interior Secretary Ken Salazar, and Agriculture Secretary Tom Vilsack.
President Barack Obama walks with aide Reggie Love, to the Oval Office of the White House in Washington, Friday, April 16, 2010, after returning from the White House Conference on America’s Great Outdoors, at the Interior Department.