President Barack Obama and first lady Michelle Obama attend memorial service for the victims of Saturday's shootings, at McKale Center on the University of Arizona campus Wednesday, Jan. 12, 2011, in Tucson, Ariz. Second from left is Daniel Hernandez, a University of Arizona political science student who helped Rep. Gabrielle Giffords when she was shot and a right is Mark Kelly, husband of Giffords. (AP Photo/J. Scott Applewhite)
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