Warren Buffett

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** FILE ** U.S. billionaire investor Warren Buffett. (AP Photo/Shuji Kajiyama, File)

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Warren Buffett (Illustration by Alexander Hunter for The Washington Times)

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President Barack Obama awards the 2010 Medal of Freedom to Warren Buffett during a ceremony in the East Room of the White House in Washington Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)

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BIG BUCKS: Microsoft mogul Bill Gates (left) and investor Warren Buffett have encouraged fellow billionaires to pledge 50 percent of their fortunes to charity. (Associated Press)