TIMOTHY A. CLARY/AFP via Getty Images This past June, New York City became the largest city to use ranked choice voting. The Board of Elections messed up on messaging and tabulation, but in the end the system worked. While the mayor race was a fiasco, ranked choice was huge for contentious city council races. Ranked-choice voting worked as intended, but its New York City debut didn't go off without a few hitches. Ranked-choice voting is a type of ballot that asks voters to list their choices — In New York's case, five — in their order of preference. When the votes are in, the lowest-ranked candidate has their ballots reallocated to their voters' second choices, and then so on and so forth until someone breaks 50%. This means a second runoff election is unnecessary — the runoff is done instantly — and that the winner with the broadest support eventually wins.