Lady Gaga Performs for Obama Staffers

President Obama fetes staffers at final inaugural ball.

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President Barack Obama's Second Inauguration

Inauguration Day 2013

Tim Flores, left, Laura Flores and others gather near the U.S. Capitol building on the National Mall for the Inauguration ceremony, Jan. 21, 2013 in Washington, DC. (Joe Raedle/Getty Images)

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