Assume that by increasing the probability of Harris winning, the probability of Trump winning decreases by the same amount.
If you would pay to increase the probability of Trump winning and decrease the probability of Harris winning, answer with a negative value.
Answer with the value that represents the most (in magnitude) that you would pay. If you are uncertain, give your under-over price where you are completely unsure whether it's a good purchase (as opposed to thinking you probably paid too much for a 1-in-a-million increase or probably should be willing to pay more for a 1-in-a-million increase in the probability that Harris wins).
Assume that you are the only person paying for this increase. I.e. It is not the case that you and others are chipping in together to increase the probability by 1-in-a-million. Rather, assume that you have a way of increasing the probability of Harris winning by 1-in-a-million at the current margin, and if you alone decide not to take the action and pay the price, then the probability of Harris winning stays at the current odds instead of increases by 1-in-a-million.
Disregard any possibly legal or ethical issues with buying election results. The question is hypothetical.