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Associated Press
FILE - In this Thursday, Jan. 20, 2005 file photo, President George W. Bush's motorcade, heavily protected by U.S. Secret Service agents, moves up Pennsylvania Avenue from the U.S. Capitol, in background, towards the White House in Washington. 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/Pablo Martinez Monsivais)

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