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Anti-MMP campaigners received a boost to their fight today, with Prime Minister John Key reiterating his support to drop the current electoral system.
In the referendum, to be held alongside the November 26 election, voters will be asked whether they want to keep MMP, and which of four systems they would prefer to swap to if MMP was thrown out.
The four other systems are First Past the Post, Single Transferable Vote, Supplementary Member and Preferential Voting.
Mr Key has previously declared a preference for changing to Supplementary Member, but has remained quiet about the referedum throughout his election campaign.
However, on TVNZ's Breakfast this morning, Mr Key said he would vote against MMP, and put Supplementary Member down as his preferred alternative system.
Keep MMP spokeswoman Sandra Grey said Supplementary Member would deliver First Past the Post-style election results.
"Under MMP you are always sure that your party vote will count even if you don't support the winning candidate in your electorate. Under Supplementary Member you can lose out in a choice of electorate MP and have a devalued party vote to boot,'' she said.
Under Supplementary Member, there are 90 electorate and 30 supplementary seats. The share of supplementary seats a party receives is based on the percentage of the party vote it wins no matter how many electorate seats it has.
One of the major parties would usually have enough seats to govern alone under the system.
- Amelia Romanos