AUGUSTA, Maine – As Maine’s June 9 primary comes to a close, campaign signs have once again become a familiar part of the political landscape.
They are posted along roadsides, clustered at intersections, planted in front yards, and lined up near polling locations. For voters, the signs can feel like little more than political wallpaper. For candidates, they are often treated as a visible test of strength, organization, and momentum.
But whether campaign signs actually win elections is a more complicated question.
Political science research suggests that yard signs and roadside signs rarely decide a race on their own. They do not replace a strong candidate, a disciplined message, a persuasive debate performance, a personal endorsement, or a serious voter-contact operation.
What they can do, however, is help at the margins.
One of the best-known studies on the subject, “The Effects of Lawn Signs on Vote Outcomes: Results from Four Randomized Field Experiments,” found that campaign signs produced a small increase in vote share. The study was authored by Donald P. Green, Jonathan S. Krasno, Alexander Coppock, Benjamin D. Farrer, Brandon Lenoir, and Joshua N. Zingher, and published in Electoral Studies.
The study is available through Yale’s Institution for Social and Policy Studies at https://isps.yale.edu/research/publications/isps16-23.
The effect was not large enough to rescue a weak campaign or overcome a major deficit, but it was meaningful enough to matter in a close race.
That may be especially true in primaries, municipal elections, county contests, school board races, and crowded fields where voters may know little about the candidates beyond their names.
In those races, name recognition matters.
That is particularly relevant in Maine’s wide-open 2026 race for governor, where no incumbent is on the ballot and both major parties are sorting through crowded primary fields.
On the Democratic side, the gubernatorial primary includes Secretary of State Shenna Bellows, Troy Jackson, Angus King III, Hannah Pingree, and Nirav Shah.
On the Republican side, the primary field includes Jonathan Bush, Bobby Charles, David Jones, James Libby, Garrett Mason, Owen McCarthy, Ben Midgley, and Robert Wessels.
Independent Richard Bennett is also running in the general election for governor.
For candidates in a field that large, signs serve one basic purpose: getting a name in front of voters repeatedly before they enter the voting booth.
A campaign sign does not explain a tax plan. It does not answer questions about a candidate’s record. It does not tell voters where a candidate stands on immigration, schools, spending, public safety, energy costs, or abortion. It does not repair a damaged reputation or answer criticism.
Its job is much simpler.
It makes a candidate visible.
That visibility can matter when a voter walks into the booth and sees a list of names, some familiar and some not. A candidate whose name has appeared for weeks on the route to work, near the grocery store, or outside a neighbor’s house may have an edge over a candidate voters have never noticed.
For well-known candidates, signs are often less about persuasion and more about presence. They show the campaign is active. They give volunteers something to do. They reassure supporters. They create the appearance of momentum.
For lesser-known candidates, signs can be more valuable. They can help introduce a name to voters who may not be following every debate, interview, mailing, or news story.
Still, not all signs carry the same weight.
A sign in a public right-of-way shows that a campaign has materials and volunteers willing to place them. A sign in a front yard can send a stronger message. It is not just advertising. It is a public endorsement by a household.
In smaller communities, that can matter.
A voter may ignore a sign on a traffic island but notice one in the yard of a neighbor, coworker, friend, or local business owner. In Maine politics, where relationships and local reputation still carry weight, that kind of quiet social signal can have an effect.
That does not mean signs are proof of support. A candidate with signs on every corner is not necessarily winning. A candidate with fewer signs is not necessarily losing.
Campaign signs can create the appearance of strength, but appearances can be misleading.
A well-funded campaign can flood an area with signs. A highly motivated volunteer team can do the same. But signs do not measure how many voters will turn out, how many doors were knocked, how many calls were made, how many ballots were requested, or how voters will make their final decision.
They are a visible piece of the campaign, not the whole campaign.
There are also rules.
In Maine, campaign signs placed in the public right-of-way are treated as temporary signs. State law allows temporary signs in the public right-of-way for a maximum of 12 weeks per calendar year, but no more than six weeks from January 1 through June 30 and no more than six weeks from July 1 through December 31.
That means primary-season signs placed in the public right-of-way cannot simply remain up indefinitely after Tuesday’s election. Campaigns and sign owners are responsible for making sure those signs comply with the legal time limits.
Temporary signs in the public right-of-way must also include the name and address of the individual, entity, or organization that placed the sign, along with the date the sign was erected. Signs may not be placed within 30 feet of another temporary sign carrying the same or substantially the same message, and they may not exceed four feet by eight feet.
State law also restricts where signs may be placed. Temporary signs may not be erected on traffic control signs or devices, public utility poles or fixtures, rotary traffic islands, trees in the public right-of-way, control-of-access areas, or medians less than six feet wide.
Candidates and campaigns are not the only ones with rules to follow.
Under Maine law, a person who takes, defaces, or disturbs a legally placed temporary sign in the public right-of-way commits a civil violation and can face a fine of up to $250. The law does not apply to someone authorized to remove the sign.
The distinction is important as campaigns begin their post-primary cleanup.
Candidates who lose Tuesday’s primary will be expected to remove their signs from public rights-of-way within the legal window. Candidates who win and move on to the November general election may continue campaigning, but they still have to comply with Maine’s temporary-sign limits and placement rules.
As the 2026 primary ends, the larger political lesson is simple.
Signs matter, but only so much.
They can help get a candidate’s name out. They can show organization. They can signal local support. They can give a campaign the appearance of momentum. In a close, low-information race, they may provide a small but real advantage.
They do not, however, get a candidate elected by themselves.
A campaign sign cannot substitute for character, competence, message, voter trust, or Election Day turnout. It cannot explain why a candidate should be trusted with public office. It cannot defend a record. It cannot persuade a voter who has already made up his mind.
As Maine voters head into the final hours of the primary, the signs lining the roads may say something about which campaigns worked hardest to be seen.
But they do not tell the whole story.
Campaign signs are not proof of victory.
They are proof of presence.
And in politics, especially in a crowded primary, being seen still matters.
I especially like the Yard signs .
They tell me where all the lunatics and haters live .