Four of the Democratic Presidential primaries were conducted with ranked-choice or instant-runoff voting.
One votes one's top preferences in candidates, and the ballots are counted in sequential-runoff fashion. The candidate with the lowest top votes is dropped, then that candidate is omitted from the ballots and the ballots are recounted. This procedure is usually continued until one candidate gets a majority.
But a variation was done for the primaries. The count was stopped when all the survivors had at least 15% of the total vote.
Unfortunately, most of the candidates dropped out before these states voted, so the voting was not as interesting as it might have been. But nevertheless, from how much each candidate got in each round of counting, one can get an idea of each voter's next preference after each candidate.
Elizabeth Warren's voters were about evenly split between Bernie Sanders and Joe Biden.
Pete Buttigieg's voters mainly went for Joe Biden and to a lesser extent, for Elizabeth Warren, and then Bernie Sanders.
Amy Klobuchar's voters mainly went to Elizabeth Warren and Joe Biden, and to a lesser extent, for Pete Buttigieg, and then Bernie Sanders.
Michael Bloomberg's voters mostly went for Joe Biden.
Tulsi Gabbard's voters went to Bernie Sanders, and to a lesser extent, to Joe Biden. Sizably less for Amy Klobuchar and especially Elizabeth Warren.
Andrew Yang's voters went to Bernie Sanders, and to a lesser extent, to Joe Biden, followed by Elizabeth Warren, and then Tulsi Gabbard.
Tom Steyer's voters went to Joe Biden, and to a lesser extent, to Bernie Sanders and Michael Bloomberg, and then Elizabeth Warren and Andrew Yang.
