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Associated Press
FILE - In this Monday, Oct. 24, 2011 file photo, Secret Service agents stand guard as President Barack Obama meets with the neighbors of homeowners Jose and Lissette Bonilla in Las Vegas. 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/Susan Walsh)

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