Stephen Wolf and a few others have asked me to compile my views. This post is an attempt to do that.
1) For all of their apparent differences, RCV and approval (and derivative ballot reforms) are philosophical bedfellows. Both proceed from the assumption that ‘better rules’ can get us closer to the general will. They therefore presume that such a thing even exists. This presumption is bolstered by inattention to well-known determinants of vote choice (e.g., party identification, cues from preferred candidates).
2) The foregoing philosophical orientation makes either cause a likely ally of those who want to eliminate political parties. Some of those people are frustrated voters (lacking, as they do, leadership to the contrary). Others are would-be elite political actors who want to replace party cues, as determinants of vote choice, with direction from the media and independent expenditures and so forth.
4) The sorts of elites described in (2) above may therefore have an easier time getting what they want through the ‘cardinal methods’ movement instead. I say “therefore” because approval has not had a chance to show its warts — at least in recent memory — and because it is objectively easier to administer.
5) Cardinal methods will fail, just as ranked ones did in the last century. The approval version of ‘ballot exhaustion’ is ‘approval truncation.’ This is a special version of the spoiler effect in which winning-minded candidates encourage bullet voting. Elite cues matter. Politics is not an unmediated transaction between citizen and state. And the result will be failure of the rule to fulfill its core promise: majority winners.
6) So the question is what other compromises the movement will make in order to get ‘demonstration cases’ of the approval ballot. In other words, what will be left in its wake? The St. Louis experience is a good signal: fully and newly nonpartisan elections.
7) Problems with nonpartisan elections are beyond the scope of this short post. For many readers, they do not need review. Other readers may be so angry at the current party system — rightly so, in my view — that some comment is warranted. I recommend this historical essay.