President Barack Obama and Vice President Joe Biden place a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Sunday, Jan. 20, 2013. (AP Photo/Susan Walsh)
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President Barack Obama and Vice President Joe Biden place a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Sunday, Jan. 20, 2013. (AP Photo/Susan Walsh)
