Illinois and Kansas swinging to Clinton vs. Obama 2012 just feels so wrong.

[Nyvin]

Illinois was particularly surprising considering it's Obama's home state (more or less).  

All the Clinton gains in the Chicago area were just too much, even with the big gains Trump made down state.

Another surprise was that Allegheny, PA actually trended and swung to the Dems.

[Nyvin]

Well, you can't expect to do well in Illinois if you can't win a single collar county. When the blue extends all the way out to Rockford, that's just too many votes to make up downstate.

If you've ever been to DuPage County, you probably know that the fact that Republicans can't win there on the presidential level despite it being tailor-made GOP territory and going red for statewide races routinely is an absolute travesty and indicative of the way the party has changed to alienate suburban voters. That county has a million people in it and used to be a Republican linchpin, but Trump got blown out there.

I'd also have to guess there's a good chance that Trump lost every township and ward in Cook county, something even John McCain didn't do.

I think Trump won the Barrington and Orland Parks areas in Cook County.

[Nyvin]

So if IL-14 gets pulled more into the Chicago area, there seems to be a good chance the Dems could draw a 12-5 map in 2020, even if they do eventually lose IL-17.   

[Nyvin]

As to Illinois.  I'm not sure what the OP is referring to.  Both Obama and Hillary Clinton won by about 17% and Obama received around 2% more of the share of the vote than Hillary Clinton did.  I suppose in the 2 candidate preferred, Hillary Clinton won by more than Barack Obama in Illinois.

Both Clinton and Trump went down by 2 points compared to Obama/Romney,  there was a larger share of the vote going to third party candidates this year.   Clinton won by 16.96%, Obama by 16.84%.   The difference is Obama won nationally by 3.9% and Clinton only by ~2.1%.    So when compared to the national popular vote, Illinois trended Democratic.