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September 11, 2012
Carolyn Kaster photo

President Barack Obama and first lady Michelle Obama, joined by members of the White House staff pause during a moment of silence to mark the 11th anniversary of the Sept, 11th, Tuesday, Sept. 11, 2012, on the South Lawn of the White House in Washington.

Charles Dharapak photo

Republican presidential candidate Mitt Romney greets firefighters at Chicago O’Hare International Airport, Tuesday, Sept. 11, 2012.