It’s administrative dysfunction & voter inexperience that leads to millions of (disproportionately Dem) ballots not counting. washingtonpost.com/lifestyle/styl…
Trump is currently creating a massive partisan divide between in-person (R) and absentee (D) votes. And absentees are rejected at much higher rates.
Once absentees were counted, that lead shrunk to 51%-46% (!). This kind of partisan divide is virtually without precedent.
No doubt postmarks/signatures will be intensely litigated. But Trump thrives on chaos/murkiness.
But, even setting aside the prospect of the Electoral College race tightening, think about how many Sen/House races are likely to come down to <2% margins.