Hillary Clinton will hold a question and answer session with billionaire Warren Buffett in San Francisco on Tuesday, an appearance that could signal that as her rival Barack Obama enjoys the endorsement of Oprah Winfrey, the well-organized Clinton campaign is being more aggressive in requesting the support of the nation's top investor. Mr. Buffett's assistant, Debbie Bosanek, said that he hasn't changed his mind and still supports both candidates.
The 77-year-old businessman hasn't endorsed a candidate, but has said he is willing to throw his substantial fundraising capabilities behind both Mrs. Clinton and Democratic rival Barack Obama.
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