STAR voting

The STAR Voting ballot, including recommended instructions and formatting details.

Graphic explaining how STAR Voting works

STAR votingis anelectoral systemfor single-seat elections.The name (an allusion tostar ratings) stands for "Score then Automatic Runoff", referring to the fact that this system is a combination ofscore voting,to pick two finalists with the highest total scores, followed by an "automatic runoff" in which the finalist who is preferred on more ballots wins. It is a type ofcardinal votingelectoral system.

Method

In STAR, voters are given a score ballot (orratings ballot) on which each voter scores candidates with a number from 0 up to 5, with 0 representing "worst" and 5 representing "best."

The scores for each candidate are then summed, and the two highest-scored candidates are selected as finalists.

In the automatic runoff round, the finalist who was given a higher score on a greater number of ballots is selected as the winner.

Usage

The concept was first proposed in October 2014 byMark Frohnmayer,and was initially calledscore runoff voting(SRV).The runoff step was introduced in order to reduce strategic incentives in ordinary score voting, such asbullet votingand tactical maximization.STAR is intended to be a hybrid between (rated)score votingand (ranked)instant runoff voting.

The first movement to implement STAR voting was centered inOregon,with chapters inEugene,Portland,Salem,Astoria,andAshland.In July 2018, supporters submitted over 16,000 signatures for a ballot initiative inLane County, Oregon,putting Measure 20-290 on the November 2018 ballot.This ballot measure did not pass, with 47.6% of voters voting yes, and 52.4% of voters voting no.

In 2019, theMultnomah CountyDemocratic Partyadopted STAR for all internal elections.

A 2020 ballot initiative for the city ofEugene(in which a 54% majority had supported the 2018 county initiative) was attempted, as well as a second attempt at Lane County,and an initiative in Troutdale, Oregon.On July 27, 2020, after the Eugene City Council deadlocked at 4-4 on a vote to refer a measure allowing STAR voting to be used in city elections to the November 2020 ballot, Eugene MayorLucy Viniscast the deciding vote against the referral, meaning that no Eugene ballot measure would be held in 2020.

TheIndependent Party of Oregonused STAR voting in their 2020 primary election.The Democratic Party of Oregon used STAR Voting for their elections for delegates to the 2020 Democratic convention.In 2022, theLibertarian Party of Oregonauthorized STAR voting for its internal elections starting in 2023.

In 2024, the city council ofOakridge, Oregonvoted 5-1 to place a STAR voting measure on the November ballot. If approved by voters, the measure would implement STAR voting for the next three elections before holding a vote on whether to permanently adopt it.

Example

Suppose thatTennesseeis holding an election on the location of itscapital.The population is concentrated around four major cities.All voters want the capital to be as close to them as possible.The options are:

• Memphis,the largest city, but far from the others (42% of voters)
• Nashville,near the center of the state (26% of voters)
• Chattanooga,somewhat east (15% of voters)
• Knoxville,far to the northeast (17% of voters)

The preferences of each region's voters are:

42% of voters Far-West	26% of voters Center	15% of voters Center-East	17% of voters Far-East
Memphis Nashville Chattanooga Knoxville	Nashville Chattanooga Knoxville Memphis	Chattanooga Knoxville Nashville Memphis	Knoxville Chattanooga Nashville Memphis

Suppose that 100 voters each decided to score from 0 to 5 stars each city such that their most liked choice got 5 stars, and least liked choice got 0 stars, with the intermediate choices getting an amount proportional to their relative distance.

Voter from/ City Choice	Memphis	Nashville	Chattanooga	Knoxville	Total
Memphis	210 (42 × 5)	0 (26 × 0)	0 (15 × 0)	0 (17 × 0)	210
Nashville	84 (42 × 2)	130 (26 × 5)	45 (15 × 3)	34 (17 × 2)	293
Chattanooga	42 (42 × 1)	52 (26 × 2)	75 (15 × 5)	68 (17 × 4)	237
Knoxville	0 (42 × 0)	26 (26 × 1)	45 (15 × 3)	85 (17 × 5)	156

The top-two frontrunners are Nashville and Chattanooga. Of the two, Nashville is preferred by 68% (42+26) to 32% (15+17) of voters, so Nashville, the capital in real life, likewise wins in the example.

For comparison, note that traditionalfirst-past-the-postwould elect Memphis, even though most citizens consider it the worst choice, because 42% is larger than any other single city.Instant-runoff votingwould elect the 2nd-worst choice (Knoxville), because the central candidates would be eliminated early. Under score voting, Nashville would have won, since it had the highest score in the first round. Inapproval voting,with each voter selecting their top two cities, Nashville would also win because of the significant boost from Memphis residents. Atwo-round systemwould have a runoff between Memphis and Nashville, where Nashville would win.

In this particular case, there is no way for any single city of voters to get a better outcome through tactical voting. However, Chattanooga and Knoxville voters combined could vote strategically to make Chattanooga win; while Memphis and Nashville voters could defend against that strategy and ensure Nashville still won by strategically giving Nashville a higher rating and/or Chattanooga and Knoxville lower ratings.

Ties

Tie votes in STAR Voting are rare, but as with any voting method they can occur, especially in elections without many voters. In most cases, ties in STAR voting can be broken by referring back to the ballots themselves for either the Scoring or Runoff round. Ties in the Scoring round are broken in favor of the candidate who was preferred by more voters. Ties in the Runoff round are broken in favor of the candidate who was scored higher. Ties which cannot be broken as above are considered a true tie.

Properties

Unlike ranked voting systems, STAR voting allows voters to express preferences of varying strengths, though unlike Score voting, it does not take voters' strength of preference into account in 2-candidate elections.

STAR voting satisfies themonotonicity criterion,i.e. raising your vote's score for a candidate can never hurt their chances of winning, and lowering it can never help their chances.It also satisfies theresolvability criterion(in both Tideman and Woodall's versions).

There are a number of othervoting system criteriait does not fully satisfy. These include themajority criterion,as it can happen that a candidate does not make it to the runoff, even though he is the first preference of a majority.It does not satisfy themutual majority criterion,although the more candidates there are in the mutual majority set, the greater the chances that at least one of them is among the two finalists in the runoff, in which case one of them will win. It does not always satisfyreversal symmetry(though it only violates it for exactly three candidates).

It also violatesparticipation,consistency;andindependence of clones(where any clones of the highest rated candidate may receive almost the same rating and enter the runoff, ahead of the second most popular non-clone).

It does not satisfy thelater-no-harm criterion,meaning that giving a positive rating to a less-preferred candidate can cause a more-preferred candidate to lose.

See also

• List of democracy and elections-related topics
• Consensus decision-making
• Decision making
• Democracy
• Relative Utilitarianism
• Highest median voting rules—similar voting method, based onmediansinstead ofaveragesand verbal appreciations instead of notes
• Unified Primary—alternate voting method fornonpartisan blanket primarythat usesapproval voting-based method in primary election

External links

• STAR voting
• The Equal Vote Coalition,an advocacy organization for STAR voting and other reforms.
• star.voteAn online platform for carrying out STAR voting elections.