President Barack Obama and first lady Michelle Obama attend an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)

Associated Press
President Barack Obama and first lady Michelle Obama attend an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)
President Barack Obama and first lady Michelle Obama attend an interfaith healing service at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013, for victims of Monday's Boston Marathon explosions. (AP Photo/Charles Krupa)
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