Barack Obama is sworn in as 44th US president by Chief Justice John Roberts beside wife Michelle on January 20, 2009 at the Capitol in Washington, DC.
President Barack Obama and first lady Michelle Obama dance at the Commander in Chief Inaugural Ball at the National Building Museum in Washington, Jan. 20, 2009.
President Barack Obama and Secretary of State Hillary Rodham Clinton speak together sitting at a picnic table, on the South Lawn of the White House, May 9, 2009. ( White House/Pete Souza)
President Barack Obama greets troops after delivering remarks at Fort Bliss in El Paso, Texas, Aug. 31, 2012. (White House/Pete Souza)