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US President Barack Obama presents the Presidential Medal of Freedom to country music legend Loretta Lynn during a ceremony in the East Room of the White House on November 20, 2013 in Washington, DC. The Medal of Freedom is the country's highest civilian honor. AFP PHOTO/Mandel NGAN/AFP/Getty Images ( 524843353 )

An officer of the US Air Force holds the Presidential Medal of Freedom to be awarded to recipients by US President Barack Obama (not pictured), during a ceremony in the East Room of the White House in Washington DC, USA, 20 November 2013. EPA/MICHAEL REYNOLDS ( USA MEDAL OF FREEDOM WHITE HOUSE )

Israeli-American psychologist Daniel Kahneman (L) shakes hands with US President Barack Obama (R), before being awarded the Presidential Medal of Freedom, in the East Room of the White House in Washington DC, USA, 20 November 2013. EPA/MICHAEL REYNOLDS ( USA MEDAL OF FREEDOM WHITE HOUSE )

Israeli-American psychologist Daniel Kahneman (L) is awarded the Presidential Medal of Freedom by US President Barack Obama (R), in the East Room of the White House in Washington DC, USA, 20 November 2013. EPA/MICHAEL REYNOLDS ( USA MEDAL OF FREEDOM WHITE HOUSE )

U.S. President Barack Obama awards the Presidential Medal of Freedom to former U.S. President Bill Clinton in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450776913 )

U.S. President Barack Obama (R) jokes with former U.S. President Bill Clinton before awarding him the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450808155 )

U.S. President Barack Obama (R) congratulates former U.S. President Bill Clinton before awarding him the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450808249 )

Oprah Winfrey reacts as U.S. President Barack Obama introduces her during a presentation ceremony for the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450809229 )

Hall of Fame baseball player Ernie Banks (L) jokes with Ben Bradlee (R), former Executive Editor of the Washington Post, before U.S. President Barack Obama awarded them the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450818439 )

U.S. President Barack Obama awards the Presidential Medal of Freedom to Hall of Fame baseball player Ernie Banks in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450818449 )

Former editor of the Washington Post Ben Bradlee (C) returns to his seat as U.S. President Barack Obama (R) and former U.S. President Bill Clinton (L) look on after Bradlee was presented with the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images) ( 450819245 )

US President Barack Obama (R) laughs beside former President Bill Clinton (L), before awarding Clinton the Presidential Medal of Freedom, in the East Room of the White House in Washington DC, USA, 20 November 2013. EPA/MICHAEL REYNOLDS ( USA MEDAL OF FREEDOM WHITE HOUSE )

Former U.S. Secretary of State Hillary Clinton (R) and her daughter Chelsea (L) greet guests before U.S. President Barack Obama awarded former U.S. President Bill Clinton the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450819649 )

U.S. President Barack Obama awards the Presidential Medal of Freedom to C.T. Vivian in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450819675 )

U.S. President Barack Obama awards the Presidential Medal of Freedom to Gloria Steinem in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450819677 )

U.S. President Barack Obama awards the Presidential Medal of Freedom to Mario Molina in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450819683 )

U.S. President Barack Obama awards the Presidential Medal of Freedom to Linnea Smith, wife of former University of North Carolina basketball coach Dean Smith, in the East Room at the White House on November 20, 2013 in Washington, DC. Dean Smith was awarded the medal but could not attend the event due to illness. (Photo by Win McNamee/Getty Images) ( 450819693 )

U.S. President Barack Obama (L) awards the Presidential Medal of Freedom to country music legend Loretta Lynn (R) in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images) ( 450819729 )

Former U.S. Secretary of State Hillary Clinton greets guests before U.S. President Barack Obama awarded former U.S. President Bill Clinton the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450819787 )

Former U.S. Secretary of State Hillary Clinton greets guests before U.S. President Barack Obama awarded former U.S. President Bill Clinton the Presidential Medal of Freedom in the East Room at the White House on November 20, 2013 in Washington, DC. (Photo by Win McNamee/Getty Images) ( 450820111 )

US President Barack Obama presents the Presidential Medal of Freedom to former Chicago Cubs baseball player Ernie Banks during a ceremony in the East Room of the White House on November 20, 2013 in Washington, DC. AFP PHOTO/Mandel NGAN/AFP/Getty Images ( 524843166 )

US President Barack Obama presents the Presidential Medal of Freedom to former Washington Post executive editor Ben Bradlee during a ceremony in the East Room of the White House on November 20, 2013 in Washington, DC. AFP PHOTO/Mandel NGAN/AFP/Getty Images ( 524843183 )

Former US president Bill Clinton (C) is applauded after receiving the Presidential Medal of Freedom during a ceremony in the East Room of the White House on November 20, 2013 in Washington, DC. AFP PHOTO/Mandel NGAN/AFP/Getty Images ( 524843268 )

US President Barack Obama presents the Presidential Medal of Freedom to former Senator Richard Lugar of Indiana during a ceremony in the East Room of the White House on November 20, 2013 in Washington, DC. AFP PHOTO/Mandel NGAN/AFP/Getty Images ( 524843338 )

US President Barack Obama presents the Presidential Medal of Freedom to jazz musician Arturo Sandoval during a ceremony in the East Room of the White House on November 20, 2013 in Washington, DC. AFP PHOTO/Mandel NGAN/AFP/Getty Images ( 524843454 )