US President Barack Obama departs Andrews Air Force Base in Washington enroute to Copenhagen to promote Chicago's bid to host the 2016 Summer Olympic Games October 1, 2009. No incumbent US President has ever addressed an IOC session before. Obama is trying to woo International Olympic Committee (IOC) members and is poised to make phone calls on his flight to Denmark to urge them to pick Chicago as host of the 2016 Summer Games. [Agencies]