Gabrielle Giffords Shooting in Arizona

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Congressional staffers observe a moment of silence on January 10, 2011 in honor of the six people killed in the shooting in Tucson.

(Saul Loeb/AFP/Getty Images)

Congressional staffers observe a moment of silence on January 10, 2011 in honor of the six people killed in the shooting in Tucson.

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History of U.S. Bombings, Failed Attempts

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