Chicago, Tokyo, Rio de Janeiro and Madrid made their presentations to the International Olympic Committee Friday in Copenhagen.
Chicago, the first city to present, counted heavily on presentations by President Barack Obama and First Lady Michelle Obama. [DePaulia coverage from sports editor Pat Flynn in Copenhagen. Read his Twitter feed]
The IOC begins several rounds of voting at 10:10 a.m. Central Time on Friday. The city with the lowest vote total is eliminated in each round, until a winner is determined. The announcement is expected to be made at 11:57 a.m. Central Time and will be broadcast live at an event in Daley Plaza.