With Rauner publicly acknowledging a goal of at least 20% in the City of Chicago and our recent in-depth discussion of the downstate vote in this race I thought I'd put together a little utility that allows you enter predictions for each candidate's performance in these various regions and see how your predictions affect the statewide total based on the 2010 vote share numbers.
You can find historical Democratic and Republican performance by region here:
Also, a summary of recent polling, including by region where available, is below.
Also, this utility defines collars as the traditional 5 collars of Lake, McHenry, DuPage, Kane and Will. For more on that topic see the FAQ here.