In voting systems, a majority means a candidate must win more than 50% of the total votes cast to succeed, whereas a plurality simply means winning the most votes, even if that share is less than a majority. While a majority requires absolute dominance over the rest of the field combined, a plurality only requires outperforming every other individual competitor on the ballot.

Understanding the difference between these two systems is fundamental to making sense of US politics, public opinion polls, and electoral reform. Depending on which system a state or municipality uses, the strategy of the candidates, the viability of third parties, and the final outcomes of elections can change dramatically.

Defining the Terms: Majority vs. Plurality #

To see these two systems in action, it helps to look at a simple mathematical scenario. Imagine an election with 100 cast ballots and three candidates running for a single seat:

• Candidate A: 45 votes (45%)
• Candidate B: 35 votes (35%)
• Candidate C: 20 votes (20%)

Under a plurality voting system, Candidate A wins the election immediately. They received 45 votes, which is more than Candidate B’s 35 and Candidate C’s 20. However, Candidate A did not win a majority of the vote. A majority requires more than 50% of the total votes—in this case, at least 51 votes. Because 55% of the voters cast their ballots for someone other than Candidate A, Candidate A won the election despite the fact that a majority of the electorate preferred other options.

The Mathematics of a Majority #

A majority is often defined as “50% plus one.” More accurately, it is any share of the vote that is strictly greater than half of the total valid votes cast.

• In an election with 1,000 voters, a majority is 501 votes.
• In an election with 1,001 voters, a majority is 501 votes.
• If there are only two candidates on a ballot, the winner must, by definition, secure a majority (excluding rare ties or invalid ballots).

The Mathematics of a Plurality #

A plurality (sometimes referred to as a relative majority) requires only that a candidate receive more votes than any other individual competitor.

• There is no minimum percentage required to win a plurality.
• In a highly fractured race with ten candidates, a candidate could theoretically win an election with just 11% of the vote, provided the other nine candidates each received less than 11%.

How Plurality Voting Works (First-Past-the-Post) #

Plurality voting is the most common electoral system in the United States. Often referred to by political scientists as First-Past-the-Post (FPTP) or Single-Member District Plurality (SMDP), this system is used to elect the vast majority of US representatives, senators, and state legislators.

In an FPTP system, the jurisdiction is divided into geographic districts, each represented by a single person. Voters choose one candidate on their ballot, and the candidate with the highest number of votes wins the seat.

PLURALITY SYSTEM (First-Past-the-Post)
[ Candidate A: 42% ]  --> WINNER (Most votes, no majority needed)
[ Candidate B: 38% ]
[ Candidate C: 20% ]

The “Spoiler Effect” and Strategic Voting #

Because plurality systems award victory to whoever has the largest single slice of the pie, they are highly vulnerable to the “spoiler effect.” This occurs when two candidates with similar political platforms split the support of a majority of voters, allowing a candidate with opposing views—but a cohesive minority base—to win the seat.

For example, if a center-left candidate and an environmentalist candidate split 60% of the vote equally (30% each), a conservative candidate with 40% of the vote will win the election under a plurality system, even though 60% of the voters preferred a left-leaning representative.

This dynamic encourages strategic voting. Voters often abandon their preferred third-party or independent candidate to support a less-preferred “major” candidate who has a realistic chance of winning, fearing that a vote for their favorite candidate will act as a spoiler and hand the victory to their least-favorite option. For those interested in how these split-ticket dynamics shape modern races, tracking real-time presidential polling data is highly valuable to see if third-party candidates are pulling enough support to shift state-level plurality outcomes.

Duverger’s Law #

The mathematical realities of plurality voting lead directly to Duverger’s Law, a principle in political science stating that single-member district plurality systems naturally tend to produce stable two-party systems. Because third-party votes are often “wasted” under plurality rules, voters and donors consolidate behind two dominant parties over time to maximize their influence.

How Majority Voting Works (and How to Achieve It) #

While plurality systems are simple to administer, they can leave voters feeling unrepresented if a candidate wins without broad support. To ensure that the winning candidate has the backing of a true majority of the electorate, some jurisdictions use majority voting systems.

Because it is rare for a candidate to secure over 50% of the vote in a multi-candidate field on the first try, majority systems must feature a mechanism to narrow down the field and produce a majority winner. The two most common methods are two-round runoffs and ranked-choice voting.

MAJORITY SYSTEM (With Runoff)
Round 1:
[ Candidate A: 45% ]  --> Advances to Round 2
[ Candidate B: 35% ]  --> Advances to Round 2
[ Candidate C: 20% ]  --> Eliminated

Round 2 (Runoff):
[ Candidate A: 52% ]  --> WINNER (Achieved a true majority)
[ Candidate B: 48% ]

1. Two-Round Runoff Systems #

In a two-round system, if no candidate wins a majority of the vote in the first round, a second election (a runoff) is held at a later date. This runoff is typically limited to the top two vote-getters from the first round, guaranteeing that one of them will secure a majority of the votes cast in the second round.

• US Examples: Georgia and Louisiana use runoff systems for congressional and state elections. If no candidate reaches the 50% threshold in the general election, the state holds a runoff election weeks later.
• The Downside: Runoffs are expensive to administer, require candidates to run two separate campaigns, and historically suffer from a significant drop in voter turnout between the first and second rounds.

2. Ranked-Choice Voting (Instant Runoff) #

Ranked-Choice Voting (RCV), also known as Instant Runoff Voting (IRV), achieves a majority winner in a single election. Instead of choosing just one candidate, voters rank the candidates in order of preference (first choice, second choice, third choice, etc.).

If a candidate wins a majority of first-preference votes, they are declared the winner immediately. If not, the candidate with the fewest first-preference votes is eliminated. The voters who chose the eliminated candidate as their number-one pick have their votes transferred to their second-choice candidate. This process of elimination and redistribution repeats until one candidate secures more than 50% of the remaining active votes.

• US Examples: Maine and Alaska use ranked-choice voting for federal elections, as do several major cities, including New York City and San Francisco.
• The Benefit: RCV eliminates the spoiler effect, encourages positive campaigning (as candidates must appeal to other candidates’ supporters for second-preference votes), and avoids the cost of holding a separate runoff election.

To see how these shifting voting trends and candidate matchups are viewed by the public, keeping an eye on presidential approval rating trends can offer deep insights into how satisfied voters are with the major-party candidates forced upon them by plurality rules.

Comparing the Systems: Pros, Cons, and Key Differences #

No voting system is perfect. Choosing between plurality and majority systems requires trading off simplicity and cost against representation and voter choice.

Why This Distinction Matters for Voters and Polls #

The difference between plurality and majority voting directly impacts how political campaigns are run and how pollsters measure public opinion.

In a plurality system, a campaign’s primary goal is often to mobilize its core base and suppress or divide the opponent’s base. If a candidate knows they only need 40% of the vote to win a three-way race, they do not need to build a broad consensus. They can focus on highly polarizing issues that appeal intensely to their core supporters.

In a majority system, candidates must appeal to a broader segment of the population. In a ranked-choice system, a candidate cannot afford to alienate rivals, because they may need those rivals’ supporters to list them as their second choice.

Pollsters must also carefully design their surveys to match the voting system in play. If a state uses plurality voting, a standard poll asking “Who would you vote for today?” is highly accurate. However, if a state uses ranked-choice voting, pollsters must ask respondents to rank their choices and simulate the elimination rounds to accurately predict the winner—a far more complex analytical challenge, which can often be anticipated by monitoring shifting probabilities on election prediction markets.

Frequently Asked Questions #

What is an absolute majority? #

An absolute majority is a voting threshold where a candidate or motion must receive more than 50% of the total votes eligible to be cast, or more than 50% of all votes cast (including blank and spoiled ballots, depending on the rules). It is distinct from a simple majority, which only requires more than 50% of the active, valid votes cast.

Can a candidate win the popular vote but lose an election? #

Yes, this occurs because of the unique structure of the US Presidential Electoral College. At the national level, a candidate must win a majority of electoral votes (270 out of 538) to win the presidency. However, 48 states and Washington D.C. award their electoral votes based on state-level pluralities (winner-take-all). If a candidate wins several states by narrow pluralities but loses other states by massive majorities, they can win the Electoral College while losing the national popular vote.

Is “majority” the same as “supermajority”? #

No. A majority is any threshold greater than 50%. A supermajority is a specified threshold that is significantly higher than a simple majority, such as three-fifths (60%) or two-thirds (66.7%). Supermajorities are typically reserved for major constitutional decisions, overriding executive vetoes, or passing specific types of legislation.

Why doesn’t the US switch entirely to majority voting? #

The US Constitution leaves the manner of holding elections up to individual states. Switching to a majority system nationwide would require 50 separate state legislatures to change their election laws. While some states and municipalities have transitioned to ranked-choice or runoff systems, many state governments prefer the familiarity, simplicity, and low cost of plurality voting, which also tends to protect the dominance of the two major political parties.