CENTENNIAL, CO - AUGUST 21: Members of the U.S. Army National Guard 8th Civil Support Unit stage outside Republican presidentia
CENTENNIAL, CO - AUGUST 21: Members of the U.S. Army National Guard 8th Civil Support Unit stage outside Republican presidential candidate John McCains campaign offices August 21, 2008 in Centennial, Colorado. A threatening letter containing white powder was received at the suburban Denver office, prompting several workers to go to a hospital on their own, though no injuries were reported. (Photo by John Moore/Getty Images)
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