Democratic presidential hopeful Hillary Clinton listens onstage during a fund-raiser December 11, 2007 in San Francisco, California. The junior U.S. senator from New York was joined by billionaire investor Warren Buffett, who has not endorsed Clinton and has also hosted a fundraiser for Clinton's chief rival for the Democratic nomination, Sen. Barack Obama of Illinois. Buffet has called both candidates 'presidential.'
(December 11, 2007 - Source: Justin Sullivan/Getty Images News)
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