President throws pitch, greets children at Nationals game
President Barack Obama throws out the ceremonial first pitch to start the baseball season for the Washington Nationals April 5, 2010, at Nationals Ball Park in Washington, D.C. The Washington Nationals honored military children, inviting nine children whose parents are deployed to step onto the infield with the starting players to see the president throw out the first pitch. (DOD photo/Navy Petty Officer 2nd Class William Selby)