12/01/2009 05:12 am ET Updated May 25, 2011

Chicago-Rio Olympic Battle Is "Close As Hell"

As First Lady Michelle Obama and talk show host Oprah Winfrey wrapped up a day of furious behind-the-scenes lobbying of International Olympic Committee members here, two sources close to the process tell CNN that the battle between Chicago and Rio is heating up, as the two cities battle to host the 2016 Summer Games.

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