

SAN FRANCISCO - DECEMBER 11: Democratic presidential hopeful Hillary Clinton and billionaire investor Warren Buffett shake hands onstage at a fund-raising event December 11, 2007 in San Francisco, California. The junior U.S. senator from New York was joined by Buffet, who has not endorsed Clinton and has also hosted a fundraiser for Clinton's chief rival for the Democratic nomination, Sen. Barak Obama of Illinois. Buffet has called both candidates "presidential." (Photo by Justin Sullivan/Getty Images)