MMP was defeated resoundingly, getting less than 37%.
And, oh, by the way, the Liberals won nearly two thirds of the seats on only 42% of the vote.
More later. Meanwhile, this thread continues to grow. Thanks for the comments. (I have weighed in there a few times, too.)
On 10 October, voters in Ontario will vote in a general provincial election. They will also vote in a very important referendum on whether to change the electoral system for future provincial parliamentary elections from the current FPTP to MMP.
The proposed MMP–mixed-member proportional–electoral system was recommended by a Citizens Assembly, made up of ordinary citizens selected (mostly) at random from the voter rolls (sort of like a grand jury). The assembly was given the task, under law, of deliberating about how elections actually work in Ontario and whether there might be a superior model. If it recommended an alternative, it was legally guaranteed that its proposal would be put up against the current system in a provincewide referendum. That time is now, and Ontario voters can decide whether to keep or change FPTP. Or, rather, a super-majority of Ontario voters can decide to change, as the proposal must obtain 60% provincewide, and majorities in at least 60% of the 107 provincial ridings (electoral districts).
Under the proposal, voters would have two votes–one for a candidate in their local riding (as now), and a second vote for a party list. There would be 90 (instead of the current 107) districts in which a single legislator would continue to be elected by plurality of votes cast. There would be 39 compensatory seats, from closed party lists, allocated to “top up” the seats of any party that had won more than 3% of the provincial party vote, but whose number of districts won was a proportional share (of the full 129 seats) that was less than its party vote share.
There is video debate on CBC that you can watch (about 6.5 minutes long), and CBC also has a list of some of the key arguments for and against.
Meanwhile, in the provincial election, it will be business as usual for FPTP. One party–and it will be the incumbent Liberal party, unless there is a very big surprise–will get “reelected” with around 42% or so of the vote, and is projected to win more than three fifths of the seats. The Conservatives–led by, and I kid you not, John Tory–will win around a third of the votes, but probably under 30% of the seats. The New Democratic Party (NDP) may win around 17% of the votes, but only around 11 seats (10%). The Greens may win five or six percent–and one poll says 11%–of the vote, but almost certainly no seats.
Obviously, Ontario has a multiparty system, and would be well served by a more proportional electoral system, which would raise the prospect of Liberals cooperating with one or more parties. If MMP were being used in this election, perhaps the Liberals would cooperate, after the election, in forming a government and passing policy with the NDP. Or they might strike a deal with the Greens, who would win anywhere from 7 to 14 seats, depending on their vote total, rather than zero. Under the current system, the Liberals will rule alone in spite of their having only 43% (or so) of the vote. Nonetheless, the referendum’s chance are considered a long shot.
The MMP proposal may not even make it over 50%. To get to 60% is hard. After all, one former FPTP jurisdiction, New Zealand, has MMP today because a vote of more than half the voters was sufficient in its 1993 referendum. The MMP proposal would have been considered defeated if 60% had been required; the change was endorsed by “only” 54% of the voters. In British Columbia in 2005 a referendum on a different electoral reform, also proposed by a Citizens Assembly, obtained around 58%, where, as in Ontario, 60% was required. (In BC, a second referendum is scheduled on the proposal.) Meanwhile, most governments in New Zealand under FPTP, as well as in Ontario and BC have been single-party majorities based on well under half of the vote–and sometimes on less than 40%.
It is perhaps surprising that a jurisdiction such as Ontario in which the ruling party usually is endorsed by well under half the voters, and where there are important parties other than the top two, would not be “ripe” for some form of proportional representation, such as MMP. However, Ontario is not exactly the most likely case for an electoral reform process to have emerged in the first place. It has had none of the serious anomalies–such as a party with the second most votes winning a majority of seats–as New Zealand had for two elections in a row (1978 and 1981), or as British Columbia had (1996).
With its multiparty politics, it has had some erratic results under FPTP, but nothing out of the ordinary. The graph below shows the patterns over recent decades.

This graph–as with others I have shown here in the block on the “seat-vote equation”–shows, in the lower segment, the deviation of the second largest party (in seats) from what it would be expected to have won, for the given votes for the parties and the size of the assembly and the number of total votes cast. On that lower (dark green) trend line, we see the identity of the second largest party. The trend line in the upper part of the graph shows how close elections have been.
The one really noteworthy–and perhaps “anomalous” election–was over twenty years ago. In 1985, the party with the most votes was the Liberals, with 37.9%, but the Conservatives, who had 37.0%, won the most seats. The Conservatives did not, however, win a majority. They won 52 of 125 seats, and the Liberals were actually able to form a minority government, with the support in parliament of the third party, the New Democrats. Then, in 1987, the Liberals called an early election and won a very large majority: 95 of 130 seats, on 47.3% of the vote.
As can be seen by the trend line in the lower portion of the graph, the electoral system has been somewhat biased against the second largest party–except in 1987, when that party was the NDP. In most elections before 2003, the second largest party was the Liberals, and they have won fewer seats than the second party would have been expected to have won (given the vote shares of the parties, the number of seats at stake, and the number of votes cast).
However, the bias has not been great, and the anomaly (if it was one) of 1985 was a long time ago. It is somewhat surprising that the Liberals actually promised prior to the 2003 election to convene a Citizens Assembly, and that they then went ahead with it. Now we are at the decision point. Will Ontario voters agree that MMP would be an improvement, or do they like the status quo electoral system in which they will most likely reelect their current government on 43% of the vote?
Epilogue
The Globe and Mail has a rather odd editorial. It almost seems to think the electoral reform is a good idea, but says to vote against it, partly because it claims the idea has been given short shrift in the general-election campaign. It suggests, rather strangely, that MMM would be better. And it wishes the threshold were at 5% instead of 3%.