Predictions?
GOP Race: Trump dominates rural illinois and Cook county, meanwhile has a poorer showing in the surrounding suburban counties but the split with cruz, kasich, rubio allows him to narrowly carry all of them. Cruz might have a better showing with rural southern Illinois.
Dem Race: Hillary dominates Cook County due to minorities and suburbs but probably does bad in Rural illinois and the deindustrializing cities along with Urbana county, DeKalb County, Springfield County where Sanders will do great for obvious reasons.
GOP side: Trump will indeed dominate downstate except that Cruz will carry a couple of evangelical-heavy counties in the NW. Trump won't dominate in Cook County, as there is a good amount of suburban vote there. I anticipate Trump in the low 40s in Cook, winning the county by ~10%. Kasich will be competitive also in the collars, but Trump will win them by ~5-7%. Kasich might contend in DuPage.
Dem side: Hillary will win Cook by ~70-30 margin. She will win Lake and DuPage collars ~55-45. She will also get St. Louis suburban counties St. Claire and Madison. Sanders will perform very well in university counties (Champaign, McLean, Jackson, etc). Like in MI, he will do well in the rural portions of the county.
Why is Cook going to give Trump a greater margin than the collars? I'd presume that the upscale white suburbs would be the harshest against him. Is it because there's still white working class GOPers in parts of Chicago?