It's been about 25 years since I last drove through the Chicago area, which means either that I've grown smarter or I have no need to put up with big city traffic. Maybe both. When I lived near there at Rantoul (Chanute AFB) almost 50 years ago, the traffic was awful, about what Denver is now, so I can't imagine what it must be like now. I'd avoid it at all costs.
You've gotten some pretty good advice, which is to change your routing. Good guess that to do so won't add all that much to your time or mileage (Mapquest is your friend). For instance, using Charleston as your start, if you plug in a stop at Normal, IL, your routing will be less than 100 miles farther and supposedly slightly over an hour longer--but you'll avoid Chicago altogether.
Or the better alternative, like many of us do: FLY! Much easier, much faster, and an adventure unto itself. Dodging Chicago again, my poky little airplane would do it in 7 flight hours, which is about what it takes me from my homedrome to OSH, a 3 leg, 2 enroute stop flight, a decent day of flying compared to 2 hard days of driving or maybe 3, depending on the weather and how tired I'm getting.
Cary