actually, barring catastrophe, i really don't see how o loses.
he is treating the election as a thing that runs for several weeks rather than a last day thing. so they have already pulled a huge number of voters through the voting booths. 60-30 lead thus far, or so time says.
it's not good enough for r to make up the ground to even in ohio. he has to be 5% ahead amongst those who haven't voted but intend to.
meanwhile, as 1/7th of the population of ohio had already voted within a few days, democrats had voted in much larger numbers. so o's machine on the ground can focus on turning out ever-diminishing numbers of dems. the size of his team relative to the number of voters grows as time passes.
i assume they are doing the same thing in every state.
may be over before the ads begin to roll en masse.