Minneapolis has now run municipal elections under ranked-choice voting for more than a decade and a half, long enough that the arguments made at adoption can be checked against results.

Advocates promised three things: more civil campaigns, higher turnout and greater representation for candidates outside established political networks. Critics predicted three others: voter confusion, invalid ballots and delayed results.

The evidence is mixed in a way that satisfies neither camp.

Turnout in municipal elections has risen, but it rose in comparable cities without the reform during the same period, and the largest single-year increases in Minneapolis coincided with contested mayoral races and national political conditions rather than with any change in ballot design.

Ballot error rates have been low. The share of ballots invalidated for improper ranking has stayed well under one percent in every cycle, and has declined as voters gained familiarity. The confusion predicted at adoption was real in the first election and largely absent by the third.

Campaign civility is the hardest to measure and the most frequently asserted. Candidates do behave differently — second-choice appeals are a real strategic consideration, and open attacks on a rival whose supporters you need are rare. Whether this constitutes civility or simply a different form of positioning depends on the observer.

The unpredicted effects have been more interesting.

The first is the near-disappearance of the primary. By consolidating municipal elections into a single November contest, ranked-choice voting eliminated a low-turnout August election that had historically been dominated by the most reliable voters. Political scientists who have studied the change argue this is the most significant democratic effect of the reform and that it has almost nothing to do with ranking.

The second is the effect on candidate supply. Ward races now routinely draw four to seven candidates, up from two or three. Running no longer risks being blamed for spoiling an election, which has lowered the cost of a first campaign.

The third is less welcome: crowded fields have raised the value of institutional endorsement and of the volunteer capacity to reach voters repeatedly. In a seven-candidate race, name recognition and organizational backing matter more, not less, which complicates the claim that the system opens the door to outsiders.

"It changed who runs more than it changed who wins," a longtime local organizer said. "That is not nothing. It is also not what was on the brochure."

Several Minnesota cities have since adopted the system, and a state bill would authorize it more broadly. The Minneapolis record is the one they will all be asked about.