Owen Hill ends U.S. Senate run, will back Cory Gardner

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Colorado Senator Owen Hill, right, passes around a bowl of snacks to his fellow senators, including Senator Ellen Roberts, inside the senate chamber on a day in which debate and voting on several gun control bills promised to continue into the night, at the State Capitol, in Denver, Friday March 8, 2013. Colorado Democrats are on the cusp of advancing gun-control proposals Friday in a state balancing a history of heartbreaking shootings with a Western heritage where gun ownership is treasured by many. (AP Photo/Brennan Linsley)