US President Barack Obama and First Lady Michelle Obama attend the groundbreaking ceremony for the Smithsonian National Museum of African American History and Culture on the National Mall in Washington, DC, February 22, 2012. Scheduled to open in 2015, the museum will be the only national museum to be entirely devoted to African American life, art, history and culture. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)