What if, on account of the Coronavirus, we attempt to hold the 2020 presidential election entirely on-line or through the mail, and it turns into a logistical nightmare? What if hackers succeed in changing votes from one candidate to another, calling into question the accuracy of the electoral count? And, what happens if our current president doesn't accept election day results if he's not declared the winner? In 2000, we learned that an exceptionally close presidential...