Warren Buffett, chairman of Berkshire Hathaway Inc., right, looks on as U.S. President Barack Obama awards author, poet, and civil rights activist Maya Angelou the Presidential Medal of Freedom at the White House in Washington, D.C., U.S., on Tuesday, Feb. 15, 2011. Obama said Buffett and 14 other people awarded the Presidential Medal of Freedom today "reveal the best of who we are and who we aspire to be." Photographer: Andrew Harrer/Bloomberg via Getty Images