[EM] simple MMP-ish idea - works with plurality voting in single-winner districts

[stephane.rouillon at sympatico.ca]

That caracteristic is one of SPPA too.
> 
> De: Adam Tarr <ahtarr at gmail.com>
> Date: 2005/08/30 mar. PM 03:54:14 GMT-04:00
> À: election-methods-electorama.com at electorama.com
> Objet: [EM] simple MMP-ish idea - works with plurality voting in
> 	single-winner districts
> 
> Just a random thought I had the other day for a PR system that would work 
> using only single-winner districts.
> 
> Every candidate has the option of declaring a party affiliation. If a 
> candidate does not declare a party affiliation, then they are a "party of 
> one" for the purposes of the algorithm.
> 
> After the election is completed in all N districts, the votes cast for each 
> party in all districts are totalled. Seats are then allocated to each 
> "party" using a typical aportionment scheme (webster's method, for 
> instance).
> 
> The winners of the election are found by maximizing the number of voters who 
> voted for the winning candidates, with the constraints that:
> 
> 1) Each "party" gets their appropriate number of seats
> 2) Each district elects exactly one candidate.
> 
> This will produce some strange results in certain cases. For instance, if 
> the Greens poll at some consistent low percentage all around a state, then 
> they might elect one candidate from a district somewhere, even though that 
> candidate finished a distant third in the election in that district. But 
> that district does get local representation, and proportionality across the 
> state is preserved.
> 
> In the case where there are only two parties, then it's easy to see what the 
> result will be. Imagine party A gets 55% of the vote in a 20-seat 
> legislature, while party B gets 45% of the vote. Then the 11 party A 
> candidates who polled highest will be elected, and the other 9 districts 
> will be won by party B. This would be true even if the party A candidate won 
> 75% of the districts due to Gerrymandering.
> 
> I don't claim that this is a great, or even an especially good PR method. 
> But it has the distinction that it works using simple plurality voting in 
> single-member districts.
> 
> -Adam
> 
> 
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