President Barack Obama is joined by members of Congress, including former astronaut Sen. Bill Nelson, right, and school children as he talks Tuesday, March 24, 2009, with astronauts on the International Space Station from the Roosevelt Room at the White House. › Watch Video of the Call | › Audio Podcast Photo credit: White House/Pete Souza March 24, 2009 NASA Identifier: 321772main_P032409PS-0083a_full