President Barack Obama signs memorabilia for March of Dimes 2013 National Ambassador Nina Centofanti

President Barack Obama signs memorabilia for March of Dimes 2013 National Ambassador Nina Centofanti, 8, at the Resolute Desk during her visit to the Oval Office, March 26, 2013. Centofanti's parents Vince and Christine, brother Nicholas, and sister Mia, not visible, stand behind her. (Official White House Photo by Pete Souza)

Featured in the Following Photo Galleries:

• Behind the Scenes in March 2013 Photo Gallery