FILE - In this Monday, June 30, 2008 file photo, Secret Service agents surround Democratic presidential candidate Sen. Barack Obama as he greets supporters in Independence, Mo. The Secret Service has been tarnished by a prostitution scandal that erupted April 13, 2012 in Colombia involving 12 Secret Service agents, officers and supervisors and 12 more enlisted military personnel ahead of President Barack Obama's visit there for the Summit of the Americas. (AP Photo/Jae C. Hong)
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