Against a non-Hillary Clinton Democratic nominee, Republicans could probably manage to win at least one. Against Clinton, no way.
Obama lost McHenry County by 9 and that's his home state.
I am pretty sure the GOP will carry McHenry County in 2016.
Oh yeah, I forgot about that county.
Come to think of it, I remember there being a thread like this a while back with a map showing that there was another collar county that would probably be Lean R in 2016, but I'll have to look around for that. I guess I wasn't keeping those snippets of info in mind when I made my post.