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UNITED STATES - SEPTEMBER 6: A Secret Service agent guards the stage before President Barack Obama's acceptance speech at the Democratic National Convention at Time Warner Cable Arena in Charlotte, N.C., on Thursday, Sept. 6, 2012. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - SEPTEMBER 6: A Secret Service agent guards the stage before President Barack Obama's acceptance speech at the Democratic National Convention at Time Warner Cable Arena in Charlotte, N.C., on Thursday, Sept. 6, 2012. (Photo By Bill Clark/CQ Roll Call)

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