The 2024 United States Senate election in Maine was held on November 5, 2024, to elect a member of the U.S. Senate to represent the state of Maine. Incumbent independent Senator Angus King won re-election to a third term, defeating Democratic nominee David Costello, Republican nominee Demitroula Kouzounas, and independent Jason Cherry. Primary elections took place on June 11, 2024.

This election coincided with five referendum questions, including a referendum to change the state flag, as well as the presidential election, U.S. House elections for the state's two congressional districts, and various other state, county and local elections.

King won re-election to a third term in office with 52.06% of the vote. He outperformed Kamala Harris in the concurrent presidential election, winning by a margin of 17.42 percentage points to Harris's margin of 6.94 percentage points. He won six counties that Harris lost.

Independents Candidates Declared Jason Cherry, attorney and former FBI agent Angus King, incumbent U.S. senator

Endorsements

Fundraising Campaign finance reports as of July 24, 2024CandidateRaisedSpentCash on handAngus King (I)$4,802,784$2,069,527$3,118,927Jason Cherry (I)$110,000$95,478$6,011Source: Federal Election Commission

Republican primary Candidates Nominee Demitroula "Demi" Kouzounas, former chair of the Maine Republican Party

Endorsements

Fundraising Campaign finance reports as of May 22, 2024CandidateRaisedSpentCash on handDemi Kouzounas (R)$300,712$55,731$244,980Source: Federal Election Commission

Results

Democratic primary Candidates Nominee David Costello, consultant and former deputy secretary of the Maryland Department of the Environment

Withdrawn Natasha Alcala, fashion designer

Fundraising Campaign finance reports as of May 22, 2024CandidateRaisedSpentCash on handDavid Costello (D)$72,408$13,302$59,424Source: Federal Election Commission

Results

General election

Predictions SourceRankingAs of The Cook Political ReportNovember 9, 2023 Inside ElectionsNovember 9, 2023 Sabato's Crystal BallSeptember 5, 2024 Decision Desk HQ/The HillOctober 11, 2024 Elections DailyMay 4, 2023 CNalysisNovember 21, 2023 RealClearPoliticsAugust 5, 2024 Split TicketOctober 23, 2024 538 October 23, 2024

Fundraising Campaign finance reports as of September 30, 2024CandidateRaisedSpentCash on handAngus King (I)$4,802,784$2,069,527$3,118,927Demi Kouzounas (R)$503,998$170,805$333,192David Costello (D)$109,637$24,063$85,894Jason Cherry (I)$110,000$95,478$6,011Source: Federal Election Commission

Polling Poll source Date(s)administered Samplesize Marginof error AngusKing (I) DemiKouzounas (R) DavidCostello (D) Other Undecided University of New HampshireUniversity of New HampshireOctober 29 – November 2, 20241,485 (LV)± 2.4%50%35%7%1%6%SurveyUSASurveyUSAOctober 24–29, 20241,079 (LV)± 3.6%54%28%8%3%8%Pan Atlantic ResearchPan Atlantic ResearchSeptember 5–15, 2024812 (LV)± 3.5%53%23%8%1%16%University of New HampshireUniversity of New HampshireAugust 15–19, 2024951 (LV)± 3.2%43%33%9%4%12%Digital ResearchDigital ResearchApril 8–30, 2024609 (RV)± 4.0%57%28%12%–3%

Results

By county

CountyAngus KingIndependentDemi KouzounasRepublicanDavid CostelloDemocraticAll OthersMarginTotal votes#%#%#%#%#%Androscoggin29,33250.4%22,07337.9%5,3549.2%1,4552.5%7,25912.5%58,214Aroostook16,72747.7%14,99642.8%2,4927.1%8202.3%1,7314.9%35,035Cumberland113,84759.6%47,37224.8%26,24913.7%2,6341.9%66,47534.8%191,102Franklin9,06751.4%6,73138.2%1,3717.8%4712.7%2,33612.2%17,640Hancock19,66654.8%11,58532.3%3,75310.4%9122.5%8,08122.5%35,916Kennebec36,39450.7%27,17037.9%6,1248.5%2,0332.8%9,22412.8%71,721Knox14,52656.6%7,87330.7%2,69510.5%5862.3%6,65325.9%25,680Lincoln12,73954.9%7,61332.8%2,2759.8%5582.4%5,12622.1%23,185Oxford16,83749.3%13,77940.3%2,5957.6%9492.8%3,0589.0%34,160Penobscot39,12345.5%35,77441.6%8,65910.1%2,4462.8%3,3493.9%86,002Piscataquis4,29142.5%4,94348.9%5955.9%2752.7%-652-7.4%10,104Sagadahoc14,32858.9%7,37330.3%2,1678.9%4391.8%6,95528.6%24,307Somerset11,98443.6%12,71346.2%1,7356.3%1,0583.8%-729-2.6%27,490Waldo12,44050.1%8,82135.5%2,50910.1%1,0784.3%3,61914.6%24,848Washington7,39841.6%8,52247.9%1,4007.9%4552.6%-1,124-6.3%17,775York65,55250.0%46,20435.2%16,50712.6%2,9062.2%19,34814.8%131,169 Totals427,33152.1%284,33834.6%88,89110.8%20,2222.5%142,99317.5%820,782

Counties that flipped from Independent to Republican Washington (largest city: Calais)

By congressional district King won both congressional districts, which both elected Democrats. District King Kouzounas Costello Representative 55% 30% 12%Chellie Pingree 49% 40% 9%Jared Golden

Notes

Partisan clients

References

External links Official campaign websites Jason Cherry (I) David Costello (D) Angus King (I) Demi Kouzounas (R)