The system, also known as instant-runoff voting, is already used in places including San Francisco , Minneapolis and Cambridge, Massachusetts, as well as in Maine. But, if approved, it would be on its biggest stage by far in New York City, where 2.1 million voters cast ballots in last year’s midterm elections.
Article source: https://www.huffpost.com/entry/nyc-ranked-choice-voting-explained_n_5dc045bbe4b0bedb2d4fed65