
What is the Supplementary Vote, and why is it being used in Manchester?
On Thursday 30 July, Greater Manchester will be electing a new mayor. The by-election follows Andy Burnham’s decision to return to Westminster, but it’s not just the mayor who will be changing. The way the voters of Greater Manchester choose their next Mayor will also change.
For the first time since it was abolished by the previous government, the traditional Supplementary Vote (SV) system will once again be used for mayoral elections.
How does the Supplementary Vote work?
Instead of voting for just one candidate, voters can mark a first choice and a second choice. If one candidate is the first choice of more than half of voters, they win immediately.
If nobody wins more than half, only the top two candidates stay in the contest. Rather than make everyone come back to pick between them, the ballots are checked again. If your first choice is one of the final two, your vote stays with them. If your first choice was knocked out, but your second choice is one of the final two, your vote is added to their total.
The Supplementary Vote is designed to stop vote splitting, which is when a large group of voters who all want roughly the same thing, split their vote between multiple candidates.
Why First Past the Post was always a poor fit for mayors
First Past the Post works by electing whichever candidate receives the most votes, even if they fall far short of half of the voters. Last year, we saw exactly what that means in practice.
In Cambridgeshire & Peterborough, Conservative Paul Bristow was elected with just 28.36% of the vote. In the West of England, Labour’s Helen Godwin won with a mere 24.97%…