Article Photos: THE RACE: Global uncertainty 11 years after 9/11



President Barack Obama and first lady Michelle Obama join members of the White House staff 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. (AP Photo/Carolyn Kaster)

President Barack Obama and first lady Michelle Obama join members of the White House staff 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. (AP Photo/Carolyn Kaster)