Supplementary Vote
An electoral system where voters indicate a first and second preference, used for London mayoral elections and some police commissioner elections until 2022.
Real World
Sadiq Khan won the 2016 London mayoral election under SV, securing victory after second-preference votes from eliminated candidates were redistributed, giving him a broader democratic mandate than first preferences alone would show.
Exam Focus
When evaluating SV, always contrast it with FPTP on the criterion of majority mandate — examiners reward precise system comparison.
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