STAR, rate these candidates on a scale of 0-5 multiple candidates can have the same rating. Done. How it's counted? Easy, the top two rated candidates go into an automatic run-off, if you rated A higher than B, your vote goes to A. if you rated them the same, your vote is counted as "no preference". Done.

That second step is mostly to get around some of the anti-democracy laws on the books in various states, but it also has the benefit of winnowing out clone candidates.