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Something I recently noticed - increased push to implement ranked choice voting everywhere. What is more strange, it always seems to be Dems promoting it and Republicans opposing it. My question is - why? First of all, why push it now, and second, why the partisan divide? I mean, if it, say, gave advantage to the minority party, then you'd expect minority Rs push it too somewhere. But it's not what I am seeing.
Not really, although I agree that is the vibe. "Ranked choice voting" isn't a technical term, but the specific system that people talking about RCV are actually talking about is usually the system called IRV (instant runoff voting) in the US and AV (alternative vote) in the rest of the world. This is a better way of counting a single-winner election like a President, Governor, directly-elected Mayor or legislator elected from a single-member district. Most of Europe is Parliamentary with the legislature elected by proportional representation, so they don't have single-winner elections that matter, and therefore don't need to think deeply about how to count single-winner elections.
The only country that uses IRV/AV in an election that matters (as opposed to non-executive figurehead Presidencies) is Australia.
The other system that Wikipedia gives as an example of RCV is STV (single transferrable vote) in multi-member districts. It is used for the lower houses of the Irish and Maltese Parliaments, and the Australian Senate. It is also very widely used to elect the governing committees of mass membership organisations like unions.
Continental Europe almost entirely uses party-list PR to elect its legislatures (some systems, including Germany, have constituency MPs but the top-up is designed so that the constituency results don't usually affect the party composition of the legislature). France uses actual runoffs in single-member constituencies, and Italy uses a hybrid of FPTP and party-list PR.
Ranked Choice Voting describes a kind of ballot design where candidates are preferentially ranked, Instant-Runoff Voting describes one way to decide a winner from such ballots.
Australia's had RCV/IRV for federal elections since 1918, and voting in federal elections has been compulsory since 1925, so it's been around a while. There's definitely better ways to decide winners than IRV from a theoretic, Bayesian regret perspective, but what's often missed about the historical popularity of IRV (and particularly its enduring path-contingency in Australia) is that it's dead simple to administer and tally compared to otherwise better methods such as approval/range. IRV solves (or solved) many of the complexities handling preferential voting in simultaneous counts across multiple voting locations in an auditable, non-destructive way (which remains one of the advantages of FPTP, for that matter). Relatedly, Australia's always voted and counted by hand (no voting/counting machines) and has generally done so quite efficiently.
True, but the only vaguely effective lobbying/activist group for alternative voting methods in the US is FairVote and they are strongly against any voting method other than IRV and one of the ways they actively try to confuse the issue is by using term "Ranked Choice Voting" to refer to Instant-Runoff Voting, as you can see on their website.
I'm confused: IRV is notable for being one of the only voting methods that fails the summability criterion making it by far the hardest to tally. Does this issue just not appear in practice because there just aren't ever that many candidates so the factorial of the number of candidates stays manageable? Or is it handled some other way?
IRV is simpler to tally and audit in low-tech scenarios because the votes themselves are the physical record of the count, an advantage it shares with FPTP. In FPTP, you sort and bundle votes into e.g rubber bands of 20 and boxes of 1000. You can easily verify a count by checking that a box indeed contains 1000 votes, and they've been sorted appropriately. It's easy to update your count report just by seeing you have X boxes and Y bands.
Approval voting, Score, Borda etc require you to maintain a store of the counts independent of the physical ballots, which introduces more room for human error and complicates recounts/verification. You need to increment up to N counts for a race with N candidates, and even approval voting has 2^N-1 ballot variations that complicates sorting.
If you're thinking of terms of low-tech boxes and counting processes, IRV is an intuitive extension of FPTP because you're just opening up eliminated boxes and resorting them. Practically, it's rare for this process to go particularly deep or be particularly sensitive, and the count of votes rarely exceeds twice the votes cast.
I think we're now able to have do much better than IRV and I think there are potentially clever ways you could do tear-off perforated ballots to make the counts under approval/range more reliable, but a lot of (sometimes conspiratorial) questions about the popularity of IRV miss that it was an intuitive and practical solution at the time. If Australian preschoolers can vote on schoolyard activities with IRV, I'm sure American adults can manage.
Oh, counting votes by sorting ballots never even occurred to me. American elections almost always have several races on the ballot, so that's not really a feasible way to organize the counting. The counting is almost always done by machine anyway, with hand-counting only for recounts.
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