After a cursory Google search it appears mail-in voting started circa September 4 and all ballots had been mailed out to voters by the beginning of October:

https://www.cnbc.com/2020/09/04/election-early-absentee-mail-voting-every-state.html

After a further cursory Google search it appears that reporting (largely in the alternative press and largely obfuscated by the MSM) regarding Russian and Chinese collusion by Hunter Biden and the “big guy” did not begin until well into October meaning that the very substantial number of persons who cast their votes early were voting blind (so to speak).

And just a couple of more observations: Did anyone else find it strange that just when news of Hunter Biden’s $3.5 million dollar payment from the Mayor of Moscow broke that was the time the MSM started braying about Trump’s tax returns (and nothing ever came of that)?

And does anyone else find it ironic that Trump collusion with Russia was never proven but it seems likely that Hunter Biden and “the big guy” have colluded with both Russia and China?