Why is DuPage County, IL so far left and liberal?

[Roll Roons]

Trump was a horrible fit for it.

Bear in mind that it's not really a Gwinnett situation where there was a ton of demographic change because it's barely grown in the past two decades. Downballot Republicans still do far better than Trump, and a non-Trump R should be able to do substantially better. Interestingly, it swung 15 points left between 2012 and 2016 but only 3 from 2016 to 2020, indicating that Democrats may be close to tapped out for now.

IDK, Illinois has such weird politics.

[Roll Roons]

Romney only barely lost it to Obama, but DuPage would have even voted for Bernie over Trump.  (Interestingly, it backed Bernie in the 2016 primary.)

It's somewhat surprising that Romney wasn't able to flip it back, this is exactly the kind of county that was full of the demographic profile he was trying to court.

Romney just barely lost it. I think he would have won it if he wasn't running against the state's favorite son.