Illinois should be interesting, as we don't know yet how local daughter Hillary nor Christie will do in the state.
My gut instinct is that Hillary will be in the lead with about 10% margin, due to Christie's recent landslide reelection, with the resulting so much favorable post-coverage and Obama's/Obamacare's record low approval ratings. Under more normal circumstances, I would expect Hillary to lead with about 15% though. Hillary will do much better than Obama in South Illinois, yet considerably worse (at least at this moment) in downtown Chicago and its suburbs. Come election time/2016, Hillary might do very well in and around Chicago though. I think Democrats' crush on Christie is a bit overhyped at the moment. Even independents will turn more sour on Christie over time.