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Associated Press
In this April 2, 2013, file photo, Vice President Joe Biden and Hillary Rodham Clinton appear onstage at the Vital Voices Global Partnership 2013 Global Leadership Awards gala in Washington. As Biden ponders a challenge to Clinton for the Democratic nomination, she has rolled out a string of high-profile endorsements in the early voting contests of Iowa and South Carolina and scheduled an onslaught of fundraisers across the country in the effort to throw cold water on a possible Biden bid. (AP Photo/Cliff Owen, File)

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