ABSTRACT
In a certain election with 100 voters, you serve as campaign manager for one of the 5 candidates. Part of your job is to persuade voters to vote for your candidate. Your staff keeps a list that tracks voters who have made a commitment to support your candidate (by ranking them first). As soon as you recognize that this list is sufficient to guarantee that your candidate will be the unique winner of the election — no matter how the other voters feel and no matter how your group of voters ranks the remaining candidates — you treat your staff to a champagne party.
