Backers of legislation calling for ranked-choice voting in Wisconsin say they have bipartisan support. The bill unveiled Wednesday is the first one to get any Republican support. Under a ranked-choice voting system, people casting ballots would rank the candidates by preference. If one of the candidates wins a majority of first-preference votes, he or she is declared the winner. If that doesn’t happen, the candidate with the fewest first-preference votes is eliminated. More candidates are eliminated until one of them does have a majority. Supporters say ranked-choice voting would make Wisconsin elections less politically polarized. Opponents call it too complicated and vulnerable to abuse.