United States Senate election in Maine, 2026 (June 9 Republican primary)
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| U.S. Senate, Maine |
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| Democratic primary Republican primary General election |
| Election details |
| Filing deadline: March 16, 2026 |
| Primary: June 9, 2026 General: November 3, 2026 |
| How to vote |
| Poll times:
6 a.m. to 8 p.m. |
| Race ratings |
DDHQ and The Hill: Pending Inside Elections: Tilt Republican Sabato's Crystal Ball: Toss-up |
| Ballotpedia analysis |
| U.S. Senate battlegrounds U.S. House battlegrounds Federal and state primary competitiveness Ballotpedia's Election Analysis Hub, 2026 |
| See also |
U.S. Senate • 1st • 2nd Maine elections, 2026 U.S. Congress elections, 2026 U.S. Senate elections, 2026 U.S. House elections, 2026 |
A Republican Party primary takes place on June 9, 2026, in Maine to determine which Republican candidate will run in the state's general election on November 3, 2026.
| Candidate filing deadline | Primary election | General election |
|---|---|---|
Heading into the election, the incumbent is Susan Collins (Republican), who was first elected in 1996.
A primary election is an election in which registered voters select a candidate that they believe should be a political party's candidate for elected office to run in the general election. They are also used to choose convention delegates and party leaders. Primaries are state-level and local-level elections that take place prior to a general election. Maine utilizes a semi-closed primary process, in which both registered party members and unaffiliated voters may participate. Unaffiliated voters may vote in one partisan primary of their choosing in each election. Affiliated voters must change enrollment at least 15 days prior to the primary to vote in a different party's primary.[1][2][3]
For information about which offices are nominated via primary election, see this article.
Thirty-three of the 100 U.S. Senate seats are up for election, and another two seats are up for special election. Democrats hold 13 of the seats up for election, and Republicans hold 22. As of January 2026, nine members of the U.S. Senate announced they are not running for re-election. To read more about the U.S. Senate elections taking place this year, click here.
This page focuses on Maine's United States Senate Republican primary. For more in-depth information on the state's Democratic primary and the general election, see the following pages:
- United States Senate election in Maine, 2026 (June 9 Democratic primary)
- United States Senate election in Maine, 2026
Candidates and election results
Note: The following list includes official candidates only. Ballotpedia defines official candidates as people who:
- Register with a federal or state campaign finance agency before the candidate filing deadline
- Appear on candidate lists released by government election agencies
Republican primary
Republican primary for U.S. Senate Maine
Incumbent Susan Collins (R), Carmen Calabrese (R), and Daniel Smeriglio (R) are running in the Republican primary for U.S. Senate Maine on June 9, 2026.
Candidate | ||
 | Susan Collins | |
 | Carmen Calabrese | |
 | Daniel Smeriglio | |
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 = candidate completed the Ballotpedia Candidate Connection survey. | ||||
| If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey. | ||||
Do you want a spreadsheet of this type of data? Contact our sales team. | ||||
Candidate profiles
There are currently no candidate profiles created for this race. Candidate profiles will appear here as they are created. Encourage the candidates in this race to complete Ballotpedia's Candidate Connection survey so that their profile will appear here. You can ask candidates in this race to fill out the survey by clicking their names below:
Voting information
- See also: Voting in Maine
Polls
- See also: Ballotpedia's approach to covering polls
Polls are conducted with a variety of methodologies and have margins of error or credibility intervals.[4] The Pew Research Center wrote, "A margin of error of plus or minus 3 percentage points at the 95% confidence level means that if we fielded the same survey 100 times, we would expect the result to be within 3 percentage points of the true population value 95 of those times."[5] For tips on reading polls from FiveThirtyEight, click here. For tips from Pew, click here.
Below we provide results for polls from a wide variety of sources, including media outlets, social media, campaigns, and aggregation websites, when available. We only report polls for which we can find a margin of error or credibility interval. Know of something we're missing? Click here to let us know.
| Poll | Dates | Calabrese | Collins | Smeriglio | Other | Undecided | Sample size | Margin of error |
|---|---|---|---|---|---|---|---|---|
– | 1 | 67 | 6 | 1 | 25 | 417 LV | ± 4.9% | |
| Note: LV is likely voters, RV is registered voters, and EV is eligible voters. | ||||||||
Campaign finance
| Name | Party | Receipts* | Disbursements** | Cash on hand | Date |
|---|---|---|---|---|---|
| Susan Collins | Republican Party | $10,153,542 | $3,409,501 | $8,039,234 | As of December 31, 2025 |
| Carmen Calabrese | Republican Party | $17,760 | $21,260 | $-3,500 | As of September 30, 2025 |
| Bill Clarke | Republican Party | $0 | $0 | $0 | Data not available*** |
| Daniel Smeriglio | Republican Party | $0 | $0 | $0 | Data not available*** |
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Source: Federal Elections Commission, "Campaign finance data," 2026. This product uses the openFEC API but is not endorsed or certified by the Federal Election Commission (FEC).
* According to the FEC, "Receipts are anything of value (money, goods, services or property) received by a political committee." |
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Ballot access
The table below details filing requirements for U.S. Senate candidates in Maine in the 2026 election cycle. For additional information on candidate ballot access requirements in Maine, click here.
| Filing requirements for U.S. Senate candidates, 2026 | ||||||
|---|---|---|---|---|---|---|
| State | Office | Party | Signatures required | Filing fee | Filing deadline | Source |
| Maine | U.S. Senate | Qualified party | 2,000 | N/A | 3/16/2026 | Source |
| Maine | U.S. Senate | Unaffiliated | 4,000 | N/A | 6/1/2026 | Source |
See also
- United States Senate election in Maine, 2026 (June 9 Democratic primary)
- United States Senate election in Maine, 2026
- United States Senate Democratic Party primaries, 2026
- United States Senate Republican Party primaries, 2026
- United States Senate elections, 2026
- U.S. Senate battlegrounds, 2026
External links
Footnotes
- ↑ Maine Revised Statutes, "Me. Rev. Stat. Ann. tit. 21–A, § 341," accessed October 2, 2025
- ↑ Maine Revised Statutes, "Me. Rev. Stat. Ann. tit. 21–A, § 142," accessed October 2, 2025
- ↑ Maine Revised Statutes, "Me. Rev. Stat. Ann. tit. 21–A, § 144," accessed October 2, 2025
- ↑ For more information on the difference between margins of error and credibility intervals, see explanations from the American Association for Public Opinion Research and Ipsos.
- ↑ Pew Research Center, "5 key things to know about the margin of error in election polls," September 8, 2016
