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Tom Charron's avatar

This is an excellent reminder that we've had (semi) proportional representation at the state level in the US -- and we can have it again! Thanks Steve for the continued great work here on DemocracySOS.

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(another Tom!)

CV allows voter to cast his/her three votes on one, two or three candidates (so should not be confused with single voting in a multimember district).

getting minority representation might depend on the minority group running just one candidate to allow votes to cumulate on just him or her.

Being X voting, not ranked votes, some votes are wasted so getting a quarter of votes is no firm threshold.

under STV a 25 percent threshold is firm quota but even then some are elected with less (or more).

but saying 25 percent may perhaps be a useful short hand, even if not quite true.

math works something like this:

successful minority group 3 votes per vote X .25 percent = 75

largest party 2 X 50 percent = 100

largest party 1 X 50 percent = 50

impossible with less than like 75 percent for party to take all three seats)

unsucc. minority 2 X 13 = 26

unsucc. minority 1 X 13 = 13

unsucc. minority 2 X 12 = 24

unsucc. minority 1 X 12 = 12

so not easy calculation

impossible with less than like 75 percent for party to take all three seats

largest party 1 vote X 75 percent =75

largest party 1 vote X 75 percent = 75

largest party 1 vote X 75 percent = 75

successful minority group 3 votes per vote X .25 percent = 75

but with presence of other minority groups (Communists, Latinos, Somalis, Polish, irish,, Green party, ) that 25/75 balance changes to perhaps something like 20 percent

Oddly can't find the exact vote share by winning candidate for say 7th district in say 1957, when CV was used.

Wikipedia no help.

also curious what "several forms" of PR were used at city level in U.S.

I know only of STV and semi-PR system: CV and limited voting

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