Thousands of spectators cheered Olympic medalists Michael Phelps, Dara Torres and Kobe Bryant on Wednesday as the city of Chicago got a high-profile boost to its bid to host the 2016 Summer Olympics.

Oprah Winfrey was taping the season premiere for "The Oprah Winfrey Show" at a downtown park, and she invited 150 U.S. Olympic athletes to join her. The athletes were introduced under a shower of red, white and blue confetti.