Massacre-hardened Colorado a gun control test case

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In this Saturday Dec. 22, 2012 photo, U.S. Army 1st Lt. Aaron Dunn, center, instructs his wife Leanne in effective hand gun operation, at Dragonman's firing range and gun dealer, outside Colorado Springs, Colo. 1st Lt. Dunn returned from a deployment in the mountains of Afghanistan on Nov. 30, 2012. (AP Photo/Brennan Linsley) Photo by
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