Another trip for Obama?

First it was Barack Obama's Supreme Court Justice nominee Sonia Sotomayor: She tripped at La Guardia Airport in New York and ended up with a fractured ankle. Then it was the President himself's turn. He nearly tripped over puppy Bo while showing NBC's Brian Williams around the White House.  Fortunately, Michelle was there to save him from a fall. We guess it wasn't the first -- and won't be the last -- time the first lady lends a hand...