FILE - This Feb. 15, 2013 file photo shows Rep. Rhonda Fields, D-Aurora, as she  urges House members to pass her bill on limiting the size of ammunition  magazines at the Capitol in Denver. Lawmakers have become the target of aggressive and sometimes threating emails and phone calls as the debate over stricter gun laws escalates in Colorado and other states. In one case, emails and a letter to Democratic Rep. Rhonda Fields was so charged with profanity and references to violence that Denver police arrested a man suspected sending the communication. (AP Photo/Ed Andrieski, File)
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