The Evidence on Ranked-Choice Voting: Does It Actually Reduce Polarization?

Over the past decade, a quiet revolution has been reshaping how Americans cast their ballots. Ranked-choice voting (RCV), once a niche academic proposal, has been adopted by more than fifty jurisdictions across the United States, including statewide implementations in Maine and Alaska. The system asks voters to rank candidates in order of preference rather than selecting just one. If no candidate wins an outright majority of first-choice votes, the lowest vote-getter is eliminated, and their supporters' votes are redistributed to their second choices. This process repeats until a single candidate crosses the fifty-percent threshold.[3]

The core promise driving this rapid expansion is that RCV can cure some of the most toxic elements of modern politics. Proponents argue that it reduces negative campaigning, curtails the viability of extreme candidates, and ensures that winners actually possess a broad mandate from the electorate. However, as the sample size of RCV elections has grown from a handful of city council races to high-stakes federal contests, political scientists and election administrators finally have enough hard data to separate the system's genuine benefits from its theoretical hype.[6]

The most robust evidence supporting RCV centers on its ability to change campaign tone. In a traditional plurality election, candidates often benefit from tearing down their opponents to suppress turnout or peel away a narrow slice of undecided voters. Ranked-choice voting fundamentally alters this calculus. Because a candidate might need the second- or third-choice votes of their rivals' supporters to survive later elimination rounds, alienating those voters with vicious attack ads becomes a mathematically losing strategy.[2]

Researchers at the National Bureau of Economic Research analyzed campaign communications across dozens of mayoral and legislative races, comparing cities that use RCV with those that do not. They found a quantifiable drop in negative messaging in RCV jurisdictions. Candidates in these races were roughly fifteen to twenty percent less likely to use attack ads, instead focusing their rhetoric on broad, unifying themes designed to make them an acceptable second choice to a wide swath of the electorate.[2][3]

Beyond campaign tone, the data suggests RCV acts as a structural guardrail against extreme candidates who benefit from crowded fields. In traditional primaries, a highly polarizing figure with a dedicated but small base can win a multi-candidate race with just thirty percent of the vote if the moderate majority splinters its support among several mainstream alternatives. Under RCV, that splintering is neutralized. The moderate votes eventually consolidate in the later rounds of tabulation, ensuring that the ultimate winner is palatable to the median voter.[5]

Alaska's recent election cycles serve as the premier case study for this moderating effect. After implementing a top-four open primary followed by an RCV general election, the state saw several races where candidates who appealed to the ideological center triumphed over more extreme challengers who had initially led in first-choice preferences. Election administrators noted that the system successfully rewarded coalition-building over base-pandering, producing representatives whose voting records more closely mirrored the overall electorate.[3][5]

However, the evidence is much weaker when it comes to RCV's impact on voter turnout. Early advocates frequently claimed that giving voters more choices and eliminating the "spoiler effect" would drive a massive surge in civic participation. Data compiled by the MIT Election Data and Science Lab paints a more complicated picture. While some local jurisdictions saw marginal turnout increases immediately following RCV adoption, there is no statistically significant evidence of a sustained, nationwide turnout boom directly attributable to the voting method itself.[1]

Instead, researchers found that turnout remains overwhelmingly driven by the competitiveness of the race and the amount of money spent on voter mobilization. RCV does not magically make apathetic voters care about an uncompetitive city council race. Furthermore, the MIT data indicates that the complexity of the ballot can occasionally deter low-information voters, offsetting some of the gains made by enthusiastic voters who appreciate the expanded choices.[1][6]

This complexity introduces the most significant critique of RCV: the "exhausted ballot" phenomenon. An exhausted ballot occurs when a voter does not rank all available candidates, and all the candidates they did rank are eliminated before the final round. In these cases, the voter's ballot does not factor into the final, deciding tally between the last two candidates. Critics argue this effectively disenfranchises voters who fail to fully utilize the ranking system.[4]

Studies from the Stanford Center on Democracy show that the exhausted ballot rate averages around four and a half percent in major RCV elections, though it can spike higher in races with exceptionally long lists of candidates. The research indicates that older voters and those with lower levels of formal education are disproportionately likely to cast ballots that eventually become exhausted, raising equity concerns among civil rights groups and election watchdogs.[4][5]

To combat this, election administrators emphasize the critical need for robust voter education campaigns prior to rolling out RCV. When cities invest heavily in public service announcements, mailers, and community outreach explaining exactly how to fill out the new ballots, error rates and exhausted ballot numbers drop significantly in subsequent election cycles. The learning curve is real, but the data suggests it is temporary and manageable with proper funding.[4][5]

Behind the scenes, the transition to RCV also requires substantial administrative heavy lifting. The Bipartisan Policy Center notes that jurisdictions must often purchase new tabulation software, redesign their physical ballots, and develop entirely new protocols for post-election audits. These upgrades require upfront capital and extensive training for poll workers, which can be a daunting hurdle for underfunded county election offices.[5]

Despite these administrative challenges, the overarching consensus from the evidence pack is largely positive. Ranked-choice voting is not a utopian fix for all democratic ailments—it will not single-handedly solve voter apathy or eliminate partisan disagreements. But the data confirms it is a highly effective mechanical tweak for disincentivizing toxic campaign behavior and ensuring that elected officials actually represent a majority of their constituents.[2][6]

As more states consider ballot measures to adopt alternative voting systems in the coming years, the debate is shifting from theoretical arguments to empirical realities. The evidence is now clear enough to guide policymakers: RCV works as intended to cool the political temperature, provided that governments are willing to invest the necessary resources into educating voters and upgrading their electoral infrastructure.[3][6]