Even before Iowa, a new idea was catching on for 2020: ranked-choice voting. At least four states that have relied on caucuses to choose their Democratic presidential nominees — Alaska, Kansas, Hawaii and Wyoming — will use the method to select their delegates this year ….. (read some history). https://www.nytimes.com/2020/02/10/us/politics/ranked-choice-voting.html
Ranked-choice is having a moment