writes "The AP reports on a system of voting, called 'cumulative voting,' which was just used under court order in Port Chester, NY. Under this system, voters can apportion their votes as they wish — all to one candidate, one to each candidate, or any combination. The system, which has been used in Alabama, Illinois, South Dakota, Texas, and New York, allows a political minority to gain representation if it organizes behind specific candidates. Courts are increasingly mandating cumulative voting when they deem it necessary to provide fair representation." Wikipedia notes
that cumulative voting "was used to elect the Illinois House of Representatives from 1870 until its repeal in 1980," without saying why the system was abandoned.