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President Barack Obama and First Lady Michelle Obama walk along the Colonnade of the White House, Sept. 21, 2010. (Official White House Photo by Pete Souza)

President Barack Obama looks back as Bo, the Obama family dog, follows him into the Oval Office, Jan. 27, 2012. (Official White House Photo by Pete Souza)

President Barack Obama and Bo, the Obama family dog, walk along the Colonnade of the White House, Sept. 10, 2010. (Official White House Photo by Pete Souza

President Barack Obama jokes with Vice President Joe Biden backstage before the STOCK Act signing event in the Eisenhower Executive Office Building South Court Auditorium, April 4, 2012. (Official White House Photo by Pete Souza)