Eric--
Say John & Mary decide to sit out an IRV election. The votes are as follows:
110: ABC 100: BAC 99: CBA
C gets eliminated and transfers to B. B now has a "majority", as defined in IRV, and wins.
But what if John & Mary, at the last minute, decided that it's important that they do their part to keep their last choice, A, from winning, and so they show up and vote sincerely, CBA.
This time B is the first candidate eliminated, and transfers to A, and A wins. But if the B voters didn't list A as their next choice, and so B didn't transfer to A, A would still win, when C is eliminated. That would be true even if the C voters, likewise, didn't rank A.
I recommend that you use this example when writng letters to the editor, or ballot arguments against IRV. Though Condorcet also fails Participation, CR doesn't. So the best public voting reform proposal, CR, passes Participation. Participation is a meaningful comparison between IRV and CR, and should be mentioned when IRV is proposed.
Mike Ossipoff
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