"President Barack Obama signs a poster for 13-year-old student Vidal Chastanet, who appeared on the ""Humans of New York""  blog, as his 6-year-old brother Alden St. Marie plays at left in the Oval Office, Feb. 5, 2015. (Official White House Photo by Pete Souza)<br /> <br /> This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House."
{}