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Edited on Fri Oct-17-03 09:11 AM by Devils Advocate NZ
We use a system called Mixed Member Proportional (MMP).
Lets just take the Senate, because the numbers are easier to crunch, and imagine that the Senate is elected under an MMP system. The way MMP works is to have half of the seats filled by direct election, and the other half to be filled by proportion of party vote.
So, for example, each state could have 1 direct (or electorate) seat that is run as a straight First Past The Post (FPP) election, with the candidate receiving the most votes winning. A second vote determines the other half of the Senate seats in propertion to the percentage of the vote gained by each party. The senate may need to be increased to 104 seats total in order that there can be 52 Electorate seats, and 52 Party seats.
So for example in a Senate election, someone might vote "John Smith (D)" to the electorate seat, and "Democratic Party" for the party vote. If John Smith gets the most votes in his electorate (state) he gains the Electorate seat in the Senate. The party vote meanwhile is added to the party votes for all other electorates, and the number of Party seats each party gains is based on a formula: If a party gains any Electorate seats, its percentage of the party vote determines its percentage of the seats gained - 20% of the party vote means 20% of the Party seats. So in the above example John Smith would get 1 electorate seat and the Party would get 10 party seats, for a total of eleven.
If a party fails to gain an Electorate seat, but receives more than 5% of the party vote, then it's percentage also become its share of the Party seats. Thus if the Green party failed to gain any Electorate seats, but received 6% of the Party vote, it would get 3 Party seats.
Any party failing to gain an Electorate seat or more than 5% of the Party votes does not gain any seats in the Senate, and there percentage of the Party votes are shared around amongst those parties that did get more than 5% or that gained an Electorate seat.
The Party seats are filled from the Party list. Before the election, the party has to create and register their list of Party seat candidates. The list is comprised of a set of names ordered from 1 to whatever the party wishes (up to the total number of party seats but that is an unlikely number to gain) and the Party seats are filled from this list, starting at 1. So if a party gets 10 party seats, the top ten names on the pre-published party list gain the seats, while numbers 11 up miss out. A properly formed list can increase a party's chances of getting a good Party vote, while the opposite can send voters flocking elsewhere, for example if a particularly hated politician turns up high on the list.
This of course means that all Senate seats have to be filled simultaneously in one election, but this will have little effect because as I understand it the idea behind having staggered elections is to ensure that there is some experience still kept within the senate. This would be covered by the party list. Important members can be listed high on the party list AS WELL as running for an electorate seat. If they gain their Electorate seat, the Party vote goes to the next one down on the list, but if they do not gain their Electorate seat, then their high placing virtually gaurantees they will receive a Party seat.
Now why this system is fair is based on the fact that you can split your vote. For example John Smith (D) may be your favourite personally, but you prefer the Green party to the Dems, so you could vote John Smith for the Electorate, and Greens for the Party, thus have your entire viepoint taken into account. If enough Dems believed this way, the Democratic party would be forced to form a coalition with the Greens in order to get ALL of the left-wing votes into a block.
This means that disgruntled Dems can still make their displeasure known to the party, without having to vote for an unwinnable candidate and thus throw the elections over to the Republicans.
Since we introduced MMP, we have had Center-Left governments after all but the first MMP election, and that first election was actually because a minor party mislead voters as to which of the major parties they would form a coalition with given enough votes. The people believed they would go with Labour, and instead they went with national. The outcry was enormous, and that minor party has struggled to achieve 5% ever since.
I can tell you this much: Corporations HATE MMP because it goes a long way to breaking their hold on the electoral process - they have to bribe far more parties to ensure control - and it is hated by the Old Boy networks in the parties themselves because dissatisfied voters can easily punish wayward parties WITHOUT ending up getting the opposition elected.
On Edit: Reordered some paragraphs for clarity.
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