Will Republicans win any of the "Collar Counties" in Illinois in 2016?

[Clarko95 📚💰📈]

DuPage, McHenry, and Kane will all probably go >50% Republican if it's a neutral election with no factors such as home state advantage, while Will County is more of a toss-up as it still has a lot of Republican exurban/rural/outer suburban areas; it could be a plurality county. Lake County will vote just slightly over 50% for the Democrat unless it's a Republican 2012 or more.

DuPage, McHenry, and Kane are all very historically Republican counties, with all going to Obama in 2008 and DuPage & Kane narrowly staying Obama in 2012 by just a few thousand votes. Will County did vote for Clinton both times, while Lake voted Clinton in 1996 (but Perot ruins our 90s election numbers), and both narrowly voted Bush both times in the 2000s. DuPage & Kane certainly would've gone for Romney if Obama wasn't from Illinois.

If Hillary is the nominee as comes close to Obama, Will and Lake will most certainly vote for her. DuPage could be a toss-up/barely R county, while the other two will vote fairly Republican unless Hillary wins in a blowout or the Republican is a truly awful fit.