Why score voting?
Understanding the spoiler effect — and how score voting fixes it.
The spoiler effect
Plurality voting — "pick one" — has a fatal flaw: similar candidates split the vote, handing the election to their common opponent.
Imagine 100 voters and three candidates: Aria, Blake, and Casey. Most voters actually prefer Aria or Blake over Casey, but Aria and Blake are similar — their supporters are split.
Example election — 100 voters
Casey wins with just 35% — even though 65% of voters prefer someone else. Aria and Blake split the vote.
This is the spoiler effect. It punishes similarity. It forces voters to abandon honest preferences and vote strategically for a "lesser evil."
Score voting: express your preferences honestly
Instead of picking one, voters score every option on a scale (0–5 or 0–10). No opinion is always available — you are never forced to rate options you do not know.
With the same 100 voters, score voting captures what plurality throws away — preference strength:
Same election under score voting (0–5)
| Voter group | Aria | Blake | Casey |
|---|---|---|---|
| 35 voters (Aria fans) | 5 | 4 | 1 |
| 30 voters (Blake fans) | 4 | 5 | 1 |
| 35 voters (Casey fans) | 1 | 1 | 5 |
| Total score | 295 | 270 | 210 |
Aria wins with a total of 295 — reflecting genuine majority preference. Casey, who had 65% of voters actively disliking them, comes last.
Score voting is also called Range Voting. It is immune to vote-splitting: adding a similar candidate cannot cause your preferred candidate to lose.
STAR voting: a runoff from honest scores
STAR (Score Then Automatic Runoff) adds one step: the two highest-scoring candidates advance to a runoff. Every ballot then automatically gives one vote to whichever of the two that voter scored higher.
This combines the preference-strength capture of score voting with the majority guarantee of a runoff — the finalist preferred by more voters wins, even if the scoring gap was small.
Why use STAR?
For high-stakes decisions where you want both expressive ballots and a clear majority mandate, STAR is the stronger choice.
Preference strength matters
Plurality discards information. If you love one candidate and barely tolerate another, your "pick one" vote looks identical to a voter who equally likes both.
Score voting captures intensity: a score of 5 means "strongly support," a score of 1 means "I can live with it." This lets the collective result reflect not just who most people prefer, but by how much.
Quick comparison
| Property | Plurality | Score | STAR |
|---|---|---|---|
| Immune to spoilers | No | Yes | Yes |
| Captures preference strength | No | Yes | Yes |
| Majority preferred finalist wins | Sometimes | Usually | Yes |
| Easy to understand | Yes | Yes | Yes |
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