Democratic presidential hopeful, Sen. Barack Obama D-Ill., bowls at Pleasant Valley Recreation Center in Altoona, Pa., Saturday, March 29, 2008.(AP Photo/Alex Brandon)
Democratic presidential hopeful, Sen. Barack Obama D-Ill., bowls at Pleasant Valley Recreation Center in Altoona, Pa., Saturday, March 29, 2008.(AP Photo/Alex Brandon)
President Barack Obama signs paperwork in his private office in the residence of the White House, March 2, 2010.
(Official White House Photo by Pete Souza)