Arizona tragedy casts pall over stunned nation

President Barack Obama observes a moment of silence for Rep. Gabrielle Giffords, D-Ariz., and the other victims of an assassination attempt against her, Monday, Jan. 10, 2011, at the White House in Washington. The shooting at a town hall-style event outside a supermarket in Tucson, Ariz., Saturday left six dead, including a federal judge, and critically wounded Rep. Gabrielle Giffords. (AP Photo/J. Scott Applewhite)

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