Chicago, Rio de Janeiro in heated battle for 2016 Olympic Games

The battle to host the 2016 Summer Olympic Games appears to be heating up between Chicago, Illinois, and Rio de Janeiro, Brazil, two sources close to the process said Thursday. The revelation came after a day of furious behind-the-scenes lobbying of International Olympic Committee members by American first lady Michelle Obama and famed talk show host Oprah Winfrey, who both hail from Chicago