Barack Obama

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US President Barack Obama walks down the West Wing Colonnade to... News PhotoBarack Obama,Government,Horizontal,International Landmark,New,Nominee,One Person,People,Politics,Samantha Power,Susan Rice,Tom Donilon,US President,USA,United Nations,Vitality,Walking,Washington DC,White House - Washington DC,White House Rose GardenPhotographer Collection: AFP 2013 AFPUS President Barack Obama walks down the West Wing Colonnade to announce that current UN Ambassador Susan Rice will replace outgoing National Security Adviser Tom Donilon and Samantha Power will become the nominee for new UN Ambassador, in the Rose Garden of the White House in Washington, DC, June 5, 2013. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)