Matt Parker is an Australian ex-pat mathematics educator in the UK. He has had a look at precinct results from Chicago and has some useful analysis to share.
Yes, he plugs his book at the end. Not going to blame him for that.
I’m not associated in any way with Matt Parker. I just like his youtube maths stuff and this was a good dig through some stuff that may get flung around in the unfolding slow-motion implosion of Trump.