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.