Biden can only win if there's massive voter fraud. Trump's followers are very enthusiastic towards him. They're never going to accept Biden as a legitimate President. As infested with Communists as this country now is, I still believe that the right makes up the majority. Especially since the radical left has assumed control of the Democratic party and commenced burning and rioting.
If Biden wins and the Bolsheviks start pushing their agenda too hard, things could get dicey. I don't think it will come to all out civil war. But things will get very tense in some parts of the country.
