content: They didn't use that many dead people.  They used switching the vote of real live people mostly.  They also used ballot harvesting of old people and mass submission on their behalf, destroying some ballots, requesting ballots in the names of anybody registered at a college campus and voting for them. It was a multi-faceted approach, that way if any one method gets admitted to occur in court, the total number of that method won't be enough to flip the state alone.  You will have to demonstrate multiple methods successfully in multiple states.