Was initially rather shocked by those Lake County numbers but apparently there just actually was a 20K undervote on the amendment.
Kind of amazing how much you can see the old party coalitions in this result. Huge over performance downstate in places like Vermillion or Gallatin, retaining old Dem holdouts like Knox, but way under performing in richest two collar counties.
It's still quite underperforming the gubernatorial vote share, though; the amendment is getting 55.4% of the vote compared to Pritzker's 59.4% so far (ditto DuPage where it's getting 53.1% vs. Pritzker's 55.9%). I'm not too surprised - these areas are still fairly fiscally conservative even though they have shifted to Democrats. You could see a similar pattern with 2020's Fair Tax Amendment.
Will County is seeing the biggest overperformance of all the collar counties (getting an 8% higher vote share than Pritzker!), which harkens back to the days when it was the most Democratic of the collars.
Any thought why Will County was so close in all the statewide races this year? Though I haven't checked for updates in a few days. I obviously only checked Dupage and Lake for updates.
Will County is less educated than the other collar counties. While they have trended sharply left in the Trump era, Will has only trended slightly left.
It's also the case I think that quite a few South/Southwest suburbs swung towards Republicans in 2020, though I believe it was mostly concentrated in suburban Cook.
Regardless in state elections Lake, Kane, and DuPage all voted to the right of Will in 2014. Lake zoomed left of it in 2018, and it seems Kane and DuPage have finally done so now. Dems gaining with wealthier more educated suburbanites checks out.