Cato will be holding this forum on instant-runoff voting later this week.

The dramatic outcome of the New York City mayoral primary, in which Zohran Mamdani outpaced former governor Andrew Cuomo and then clinched the win with second-choice votes from other candidates, has drawn attention to the city’s use of ranked-choice voting. Several other major cities also use ranked-choice voting, as do Maine and Alaska. What lessons does the New York City primary hold for this and other electoral reforms?