Considering the landslide results of Pritzker in Illinois, in DuPage Rauner polled competitively at Pritzker 48%-Rauner 46%. DuPage has been slowly shifting leftward in recent Presidential Elections. I think Biden would carry DuPage but the margin will only be slightly larger than in 2016, perhaps Biden 55%-Trump 37%.
There are not really any third parties so there will not be that big of a gap. I was guessing like 54 to 56% for Biden to 43 to 45% for Trump but now that we are having this pandemic DuPage could produce a result of 59 to 40 for Biden. Essentially matching its 2018 congressional vote.
The collar counties will almost always vote to the right of the state. But the fact that they vote mainly Democratic now despite the anti-Chicago vs rest of state dynamic and being relatively white is something.
Rauner of course polled competitively in DuPage. Pritzker was a very poor candidate for the county. All in all Rauner wasn't a bad fit for suburban Chicago. But he was an ineffective governor.
