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

Sen. Charles Schumer, D-N.Y., arrives at the U.S. Capitol for the ceremonial swearing-in of President Barack Obama during the 57th Presidential Inauguration in Washington, Jan. 21, 2013. (Susan Walsh/AP Photo )

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