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FILE - In this Feb. 15, 2010, file photo President Barack Obama congratulates Warren Buffett after presenting him with a 2010 Presidential Medal of Freedom in an East Room ceremony at the White House in Washington. In his weekly radio and internet address Saturday April 14, 2012, Obama urged Americans to ask their member of Congress to support the "Buffett Rule," named after the billionaire investor who says he pays a lower tax rate than his secretary. Obama says the nation can't afford to keep giving tax cuts to the wealthiest, "who don't need them and didn't even ask for them." (AP Photo/Carolyn Kaster)