  We propose a new single-winner voting system using ranked ballots: Stable
Voting. The motivating principle of Stable Voting is that if a candidate A
would win without another candidate B in the election, and A beats B in a
head-to-head majority comparison, then A should still win in the election with
B included (unless there is another candidate A' who has the same kind of claim
to winning, in which case a tiebreaker may choose between such candidates). We
call this principle Stability for Winners (with Tiebreaking). Stable Voting
satisfies this principle while also having a remarkable ability to avoid tied
outcomes in elections even with small numbers of voters.
