"It really is the most incredible city, incredible town, I think, in America," said Hayes. A video of the actor, who is from the Chicago suburbs, talking about the Olympics is available for viewing on Dec's website, AChicagoThing.com.
Dec began releasing the videos on Tuesday morning. He said there are plenty more he'll post, including videos from Dan Akroyd, Andy Roddick, Jeremy Piven, Venus Williams, George Lopez, and David Schwimmer.
The International Olympic Committee will announce the winner of the 2016 Summer Games on October 2 in Copenhagen, Denmark.
Check out the celebrity videos supporting the Olympic bid, at achicagothing.com
Other celebrities who have already shown their support include Oprah Winfrey, who attended a dinner when the IOC was in town, and Michael Jordan, who appeared on a PSA for Chicago 2016. President Barack Obama has also done his part, sending a videotaped message to a group in Africa and naming senior adviser Valerie Jarrett to lead White House efforts to bring the bid to Chicago.