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UNITED STATES - JANUARY 8: U.S. Capitol Police stand guard outside of Rep. Gabrielle Giffords' Capitol Hill office in the Longworth House Office Building after the congresswoman was shot in her home district in Tucson, Ariz., on Saturday, Jan. 8, 2011.  (Photo By Bill Clark/Roll Call)

UNITED STATES - JANUARY 8: U.S. Capitol Police stand guard outside of Rep. Gabrielle Giffords' Capitol Hill office in the Longworth House Office Building after the congresswoman was shot in her home district in Tucson, Ariz., on Saturday, Jan. 8, 2011. (Photo By Bill Clark/Roll Call)

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