4 of 44: President Barack Obama, first lady Michele Obama, left, Army Major General Michael Linnington, Joint Forces Headquarters, National Capitol Region, center, and Vice President Joe Biden and his wife Jill Biden, place their hands over their hearts as they review the troops following his ceremonial swearing-in during the 57th Presidential Inauguration at the U.S. Capitol in Washington, Monday, Jan. 21, 2013. (AP Photo/Cliff Owen) (AP Photo/ Cliff Owen)

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