Arlington County ran a proportional preferential voting system for the Democratic Party primary for two Board seats. One candidate from each voting block was elected. Likely that the traditional method would have given one block both primary seats. There was no mention of the proportionality part prior to the vote. Lots of talk about the preferential part. Apparently this was one of the first ever use of proportional preferential voting in the US. https://vote.arlingtonva.gov/Ranked-Choice-Voting #voting #Arlington #RCV