CENTENNIAL, CO - AUGUST 21: Emergency response officers stage outside of presumptive Republican presidential nominee Sen. John
CENTENNIAL, CO - AUGUST 21: Emergency response officers stage outside of presumptive Republican presidential nominee Sen. John McCains (R-AZ) campaign offices August 21, 2008 in Centennial, Colorado. Several people working in the office were hospitalized and released after a letter was sent to the office that contained a white powder. (Photo by Chip Somodevilla/Getty Images)
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