Today the Chicago 2016 delegation made their case to the European Olympic Committees General Assembly, which is taking place in Istanbul. President-elect Obama's contributed to their efforts with this video.
According to the AP report on the meeting, the Chicago 2016 folks see Obama as a big potential draw to the Windy City:
Photos of Obama were sprinkled throughout Chicago's 20-minute presentation, including a shot of him delivering his acceptance speech in Grant Park. His taped message was introduced by Chicago Mayor Richard M. Daley, who said they share a goal of inspiring young people to participate in sports.