greg will fill in the details, if you want them.
https://www.counterpunch.org/2020/08/21/how-to-rig-an-election-an-interview-with-greg-palast/
how do you spot this on your own?
here's the trick: whenever you hear politicians complain the other side is rigging the election, what they're doing is called projection, a kind of pseudo-scientific idea that poli sci has yanked from psychology with great insight.
so, the reason it was obvious that trump was up to something is that he told us he was, by blaming it on the democrats out of the blue.