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| Elections in Maine |
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The 2026 United States Senate election in Maine will be held on November 3, 2026, to elect a member of the United States Senate to represent the state of Maine. Incumbent Republican Senator Susan Collins has stated that she intends to run for re-election for a sixth term, though she has not formally launched a campaign. [1]
This will be the only Republican-held Senate seat up for election in 2026 in a state that Kamala Harris won in the 2024 presidential election. Collins is the only incumbent Republican senator in any of the 19 states that Donald Trump did not win in any of his three elections. [2]
This election will coincide with U.S. House elections for Maine's two congressional districts, a gubernatorial election, and various other state, county and local elections. The primary is scheduled to take place on June 9, 2026. Both the primary and general elections will be conducted with ranked-choice voting. [3]
The northernmost state in New England, Maine is one of the most rural states in the nation, and is considered to be a moderately blue state, having voted for every Democratic presidential nominee since 1992, and voting for Kamala Harris by about seven percentage points in 2024. Democrats also control the governorship, the state legislature, and both seats in Maine's U.S. House congressional delegation. [4] Furthermore, after Jared Golden defeated Bruce Poliquin in Maine's 2nd congressional district in 2018, Collins has been the only Republican representing any state in New England at the federal level, in either chamber of Congress. [5]
Collins was first elected in 1996, and was re-elected in four subsequent elections, significantly outperforming other Republicans in the state. In 2020, despite almost all polls and analysts predicting that she would lose her re-election bid, Collins unexpectedly defeated Democratic nominee Sara Gideon by about eight percentage points. Democratic presidential nominee Joe Biden carried Maine by about nine percentage points on the same ballot. [6]
As the only Republican-held Senate seat up for election in a state that Kamala Harris won in the 2024 presidential election, and Collins' record of over-performance, despite the state's Democratic lean, Maine is considered a key Senate battleground in 2026. This Senate seat has been held by Republicans since 1979, when Collins' predecessor, Republican William Cohen, defeated incumbent Democrat William Hathaway. Cohen's victory over Hathaway is the last time an incumbent U.S. Senator has been defeated for re-election in Maine. A Democrat has not been elected to the U.S. Senate from Maine since George J. Mitchell was re-elected in 1988. [a]
With the decline of ticket splitting, and being in a mid-term year with a Republican president, Collins is widely viewed as the most vulnerable incumbent Republican senator. [7] [8] Following the retirement of Joe Manchin in West Virginia, and the defeats of Democratic senators Jon Tester in Montana and Sherrod Brown in Ohio in 2024, Collins remains the last senator to represent a non-swing state of the opposite party (i. e., a reliably red or blue state).
Collins was first elected in 1996, and has served five consecutive terms. [9] While she has the firm backing of national Republicans, [10] three conservative Republicans are challenging Collins in the primary. [11]
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| Susan Collins (R) | $7,933,772 | $2,526,858 | $6,702,107 |
| Source: Federal Election Commission [17] | |||
| Poll source | Date(s) administered | Sample size [c] | Margin of error | Carmen Calabrese | Susan Collins | Dan Smeriglio | Other | Undecided |
|---|---|---|---|---|---|---|---|---|
| University of New Hampshire [18] | October 16–21, 2025 | 417 (LV) | ± 4.8% | 1% | 66% | 1% | 4% [d] | 27% |
In April 2025, Jordan Wood became the first Democrat to announce his Senate candidacy. Wood previously worked as chief of staff to U.S. Representative Katie Porter, and helped lead the End Citizens United political action committee. [19] [20] On August 19, 2025, Sullivan Harbor Master Graham Platner announced his candidacy, [21] receiving the support of organized labor and Vermont Senator Bernie Sanders. [22] Progressive, and younger, Democratic senators, like Elizabeth Warren, Chris Murphy, Sheldon Whitehouse, and Andy Kim, have also expressed support for Platner's candidacy, while stopping short of endorsing in the primary, as of October 2025. [23] [24] Term-limited Governor Janet Mills was seen as a potential candidate to challenge Collins for months, with national Democrats like the Senate Minority Leader Chuck Schumer, Senator Kirsten Gillibrand, and the Democratic Senatorial Campaign Committee (DSCC) encouraging her to run, [25] [26] [27] [28] though others, such as Sanders, have publicly discouraged her from running. [29] Leaked campaign documents in early October indicated that Mills was set to enter the race shortly, [30] and Mills officially announced her campaign on October 14. [31] [32] Mills would be the oldest freshman senator in history, at 79 years old at the start of the term should she be elected, causing some to express concern about her age. [33] [32] Mills has said she plans to serve one term should she be elected. [34] Several other Democrats have also announced campaigns. After Mills' announcement, Democratic candidates Dan Kleban and Daira Smith-Rodriguez withdrew their candidacies and endorsed Mills. [35] [36] The DSCC and Mills formed a joint fundraising committee for her campaign leading to backlash and allegations of undue favor towards Mills in the primary from the Senate Democratic leadership. [37] [38] [39] [40] [41]
Shortly after Mills entered the race, Platner came under fire for resurfaced controversial Reddit posts, resulting in his campaign's political director, former state representative Genevieve McDonald, quitting the campaign and calling Platner "unelectable". However, Democratic National Committee Chair Ken Martin stated that the comments were not disqualifying, [42] and Platner apologized in a five-minute video posted to social media. On October 21, Platner released a video of himself dancing and singing shirtless at his brother's wedding, revealing he had a chest tattoo that resembled the Totenkopf used by Nazi Germany's Schutzstaffel . Platner stated he got the tattoo while inebriated with other Marines while stationed in Croatia, mistaking the symbol for a skull and crossbones. He had the tattoo covered, [43] and professed his shame and disgust for getting a tattoo that resembled the fascist insignia. [44] Platner also called himself an anti-fascist "supersoldier" in an old Reddit comment. [45] Senator Chris Murphy defended Platner in an interview and said that he "sounds like a human being to me" [46] [47] [48] while Senator Ruben Gallego called his campaign "authentic" and said that he has "the right to grow out of his stupidity" and is not going to be a "crypto Fetterman". [49] [50]
On November 12, Wood withdrew from the race to instead run for the U.S. House of Representatives seat in Maine's 2nd congressional district after incumbent Democrat Jared Golden announced he would not seek re-election. [51]
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| David Costello (D) | $19,873 | $5,121 | $14,752 |
| Tucker Favreau (D) | $6,128 | $1,246 | $4,882 |
| Dan Kleban (D) [f] | $336,745 | $115,719 | $221,026 |
| Graham Platner (D) | $3,248,760 | $1,007,837 | $2,240,923 |
| Daira Smith-Rodriguez (D) [f] | $188,832 | $33,305 | $155,527 |
| Jordan Wood (D) [f] | $3,098,912 | $2,178,443 | $920,470 |
| Source: Federal Election Commission [17] | |||
Aggregate polls
| Source of poll aggregation | Dates administered | Dates updated | Janet Mills | Graham Platner | Jordan Wood | Other/Undecided [g] | Margin |
|---|---|---|---|---|---|---|---|
| RealClearPolitics [96] | October 16 – 29, 2025 | November 17, 2025 | 31.5% | 49.5% | 3.0% | 16.0% | Platner +18.0% |
| Race to the WH [97] | July 11 – December 4, 2025 | December 4, 2025 | 35.1% | 50.5% | 2.1% | 14.4% | Platner +15.4% |
| Average | 33.3% | 50.0% | 2.6% | 15.2% | Platner +16.7% | ||
| Poll source | Date(s) administered | Sample size [c] | Margin of error | David Costello | Janet Mills | Graham Platner | Jordan Wood | Other | Undecided |
|---|---|---|---|---|---|---|---|---|---|
| Z to A Research (D) [98] [A] | November 14–18, 2025 | 845 (LV) | ± 3.0% | 0% | 38% | 58% | – | 2% [h] | 2% |
| Maine People's Resource Center [99] | October 26–29, 2025 | 783 (V) | ± 3.5% | – | 39% | 41% | 5% | – | 14% |
| – | 47% [i] | 53% | – | – | – | ||||
| SoCal Strategies [100] | October 21–25, 2025 | 500 (LV) | ± 4.4% | 1% | 41% | 36% | 2% | – | 20% |
| NRSC (R) [101] | October 22–23, 2025 | 647 (LV) | ± 3.5% | – | 25% | 46% | 3% | – | 26% |
| University of New Hampshire [18] | October 16–21, 2025 | 510 (LV) | ± 4.3% | 1% | 24% | 58% | 1% | 1% [j] | 14% |
| Campaign finance reports as of September 30, 2025 | |||
|---|---|---|---|
| Candidate | Raised | Spent | Cash on hand |
| Phillip Rench (I) | $55,313 | $31,072 | $24,241 |
| Source: Federal Election Commission [17] | |||
| Source | Ranking | As of |
|---|---|---|
| Inside Elections [103] | Tilt R | August 12, 2025 |
| The Cook Political Report [104] | Tossup | October 14, 2025 |
| Sabato's Crystal Ball [105] | Tossup | October 14, 2025 |
| Race To The WH [106] | Tossup | September 4, 2025 |
Susan Collins vs. Janet Mills
| Poll source | Date(s) administered | Sample size [c] | Margin of error | Susan Collins (R) | Janet Mills (D) | Other | Undecided |
|---|---|---|---|---|---|---|---|
| Maine People's Resource Center [99] | October 26–29, 2025 | 783 (LV) | ± 3.5% | 46% | 42% | – | 14% |
| Zenith Research (D) [107] [B] | October 7–10, 2025 | 501 (LV) | ± 4.4% | 37% | 42% | 10% [k] | 12% |
Susan Collins vs. Graham Platner
| Poll source | Date(s) administered | Sample size [c] | Margin of error | Susan Collins (R) | Graham Platner (D) | Other | Undecided |
|---|---|---|---|---|---|---|---|
| Maine People's Resource Center [99] | October 26–29, 2025 | 783 (LV) | ± 3.5% | 41% | 45% | – | 14% |
| Zenith Research (D) [107] [B] | October 7–10, 2025 | 501 (LV) | ± 4.4% | 38% | 38% | 10% [k] | 15% |
| Poll source | Date(s) administered | Sample size [c] | Margin of error | Susan Collins (R) | Dan Kleban (D) | Undecided |
|---|---|---|---|---|---|---|
| Public Policy Polling (D) [108] [C] | September 8–9, 2025 | 642 (RV) | – | 35% | 44% | 21% |
| Poll source | Date(s) administered | Sample size [c] | Margin of error | Susan Collins (R) | Generic Democrat | Undecided |
|---|---|---|---|---|---|---|
| Cygnal [109] | November 10–11, 2025 | 600 (LV) | ± 4.0% | 41% | 49% | 11% |
Partisan client
Collins is now the lone outlier among all 100 senators as someone who continues to hold a Senate seat in a state that hasn't supported her party's presidential nominee in decades. Such outliers were important parts of past recent Democratic Senate majorities, but they will now be all gone.
{{cite web}}: CS1 maint: multiple names: authors list (link)Former state Sen. Cathy Breen of Falmouth said Tuesday she is considering a bid
'I'm exploring the opportunity and thinking about what a run would look like,' Mr. Fecteau said
Prominent political figures have as well, including Democratic governors Gretchen Whitmer of Michigan, Andy Beshear of Kentucky and Michelle Lujan Grisham of New Mexico.
Whether Platner can surmount any fallout from the posts may depend on how well he can incorporate them effectively into his regular-guy image — and whether there is more from his past to be exposed. One good sign for him: Two of his backers in the Senate seem unperturbed so far:
Platner also received a PAC donation from Sen. Martin Heinrich, D-N.M.
...said former Waterville mayor Karen Heck, who is supporting Platner in the primary.
After launching his campaign, Kleban announced later Wednesday Maine Senate President Mattie Daughtry and Lucas St. Clair, national board chair of the Trust for Public Land, as his campaign co-chairs.
King said Wednesday that his general practice is not to campaign against colleagues, and he expects to stick with that next year — including not endorsing in the primary.
Wood declined to endorse in the Senate race following his withdrawal but said he'd "support whoever the Democratic nominee is."