I don't see how Sanders wins Illinois unless he carries Cook County by double digits and the black vote pretty much makes that impossible. The collar counties are too wealthy to have a reason to vote for him. If he only barely won in Michigan, it's hard to see him carry Illinois.
Well, if this year is anything like 2008 demographics wise, there should be about 19% non-black/non-white voters (Latino+Other). If Sanders gets the same percentages of Blacks and Whites in Illinois that he got in Michigan (56% and 28%), he'll need about 56% of the (Latino+Other) vote as well to win.
