
President Barack Obama and first lady Michelle Obama play with toy swords as they host an event on Olympics, Paralympics and Youth Sport, Wednesday, Sept. 16, 2009, on the South Lawn of the White House in Washington.
(AP Photo/Gerald Herbert)

President Barack Obama uses a light saber as he watches a demonstration of fencing at an event supporting Chicago's 2016 host city Olympic bid, Wednesday, Sept. 16, 2009, on the South Lawn of the White House in Washington. At rear is Chicago Mayor Richard Daley and first lady Michelle Obama.
(AP Photo/Charles Dharapak)

President Barack Obama uses a light saber as he 'attacks' Olympic fencer Tim Morehouse who won a silver medal in Men's Saber Fencing at the Beijing Olympics, Wednesday, Sept. 16, 2009, during an event supporting Chicago's 2016 host city Olympic bid, on the South Lawn of the White House in Washington. At rear is first lady Michelle Obama.
(AP Photo/Charles Dharapak)

U.S. President Barack Obama uses a plastic saber to show his fencing stance during an Olympic Games event on the South Lawn of the White House in Washington, September 16, 2009. The city of Chicago is vying for the 2016 Summer Olympics. REUTERS/Larry Downing
(UNITED STATES POLITICS SPORT OLYMPICS IMAGES OF THE DAY)

President Barack Obama watches a gymnastics demonstration on the South Lawn of the White House in Washington, Wednesday, Sept. 16, 2009, during an event supporting Chicago's 2016 host city Olympic bid.
(AP Photo/Charles Dharapak)

U.S. President Barack Obama is joined by first lady, Michelle Obama, and Olympic gold medalist Jackie Joyner Kersee (R) as they watch a Judo demonstration during an Olympic Games event on the South Lawn of the White House in Washington, September 16, 2009. Chicago is vying for the 2016 Summer Olympics.
REUTERS/Larry Downing (UNITED STATES POLITICS SPORT JUDO)

President Barack Obama shows an Olympic Medal to Louis Schaab, left, Nate Murray, center, and Joel Pool, all with the National Rehab Hospital sled hockey team, Wednesday, Sept. 16, 2009, during an event on Olympics, Paralympics and Youth Sport, on the South Lawn of the White House in Washington.
(AP Photo/Gerald Herbert)

President Barack Obama, first lady Michelle Obama, former Olympic track star Jackie Joyner Kersee, second from right, and Paralympian track athlete April Holmes, right, laugh on the South Lawn of the White House in Washington, Wednesday, Sept. 16, 2009, where they hosted an event on Olympics, Paralympics and Youth Sport.
(AP Photo/Gerald Herbert)