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David Costello

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David Costello
Image of David Costello

Democratic Party

Candidate, U.S. Senate Maine

Elections and appointments
Next election

November 3, 2026

Education

Bachelor's

The George Washington University, 1983

Graduate

London School of Economics and Political Science, 1989

Personal
Birthplace
Bangor, Maine
Religion
Roman Catholic
Profession
Government
Contact

Campaign website

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David Costello (Democratic Party) is running for election to the U.S. Senate to represent Maine. He declared candidacy for the 2026 election.[source]

Biography

David Costello was born in Bangor, Maine. Costello earned a bachelor's degree from The George Washington University in 1983 and a graduate degree from the London School of Economics and Political Science in 1989. His career experience includes working as an environmental policy consultant.[1]

Elections

2026

See also: United States Senate election in Maine, 2026

Note: At this time, Ballotpedia is combining all declared candidates for this election into one list under a general election heading. As primary election dates are published, this information will be updated to separate general election candidates from primary candidates as appropriate.

General election

The general election will occur on November 3, 2026.

General election for U.S. Senate Maine

The following candidates are running in the general election for U.S. Senate Maine on November 3, 2026.

Candidate
Image of Susan Collins
Susan Collins (R)
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Natasha Alcala (D)
Image of David Costello
David Costello (D)
Image of Tucker Favreau
Tucker Favreau (D) Candidate Connection
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Andrea LaFlamme (D)
Image of Janet T. Mills
Janet T. Mills (D)
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Graham Platner (D)
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Daira Rodriguez (D)
Image of Carmen Calabrese
Carmen Calabrese (R)
Image of Daniel Smeriglio
Daniel Smeriglio (R)
Image of David Evans
David Evans (Independent)
Image of Phillip Rench
Phillip Rench (Independent) Candidate Connection

Incumbents are bolded and underlined.

Candidate Connection = candidate completed the Ballotpedia Candidate Connection survey.
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Withdrawn or disqualified candidates

Endorsements

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2024

See also: United States Senate election in Maine, 2024

General election

General election for U.S. Senate Maine

The ranked-choice voting election was won by Angus King in round 1 .

Incumbents are bolded and underlined. The results have been certified. Source

Total votes: 826,421
Candidate Connection = candidate completed the Ballotpedia Candidate Connection survey.

Democratic primary election

Democratic Primary for U.S. Senate Maine

The following candidates advanced in the ranked-choice voting election: David Costello in round 1 .

There were no incumbents in this race. The results have been certified. Source

Total votes: 54,537
Candidate Connection = candidate completed the Ballotpedia Candidate Connection survey.

Withdrawn or disqualified candidates

Republican primary election

Republican Primary for U.S. Senate Maine

The following candidates advanced in the ranked-choice voting election: Demi Kouzounas in round 1 .

There were no incumbents in this race. The results have been certified. Source

Total votes: 58,832
Candidate Connection = candidate completed the Ballotpedia Candidate Connection survey.

Endorsements

Ballotpedia did not identify endorsements for Costello in this election.

Campaign themes

2026

Ballotpedia survey responses

See also: Ballotpedia's Candidate Connection

Candidate Connection

David Costello has not yet completed Ballotpedia's 2026 Candidate Connection survey. Send a message to David Costello asking him to fill out the survey. If you are David Costello, click here to fill out Ballotpedia's 2026 Candidate Connection survey.

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You can ask David Costello to fill out this survey by using the buttons below or emailing campaign@costelloforsenate.com.

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2024

Candidate Connection

David Costello completed Ballotpedia's Candidate Connection survey in 2023. The survey questions appear in bold and are followed by Costello's responses. Candidates are asked three required questions for this survey, but they may answer additional optional questions as well.

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I was born in Bangor in 1960 and raised in Old Town, Maine by his mother Gail, and maternal grandparents, Alfred and Pauline Baillargeon. My father John, an Army veteran and AFL- CIO organizer, died in 1968 at the age of thirty-one. The grandson of French and Irish American shoe, textile, and railroad workers, I learned the value of hard work at an early age. And, like many in Maine, I was the first in his family to earn a bachelor’s degree and a master’s degree having worked my way through the University of Maine, George Washington University, and the London School of Economics and Political Science. With more than twenty-five years of senior- level government experience, I believe that I have the knowledge and skills necessary to make a meaningful difference in Washington. During my career, I have managed complex, multi-million-dollar programs both in the U.S. and overseas - including initiatives to combat climate change, revitalize communities, protect public health and the environment, and advance peaceful democratic change in such conflict-torn countries as Cambodia, Haiti, Bosnia, Croatia, Serbia, and Kosovo.
  • Partisan gridlock abounds and our imperfect democracy is in danger of becoming even more flawed. To fix it, we need to do more than simply change who we elect every two to six years. We need to substantially reform our governing practices and institutions, and we need to eliminate the excessive and corrupting influence that money, wealth, and disinformation have over our politics and government.
  • I am running for the United States Senate because I want to advance long-overdue reforms that will not only help end gridlock in Washington but also help in protecting our rights and freedoms and assist in addressing such pressing problems as climate change, uneven economic prosperity, inadequate health care, shoddy infrastructure, under performing schools, increasing gun violence, and insufficient retirement security. I am also running because I want to help in ensuring that all Mainers are provided with the education, job skills, and other life-enriching opportunities to thrive. Having grown up in a working-class family I can appreciate the challenges confronting many of Maine’s less affluent families.
  • As Senator, I will back efforts to: enact pro-democracy campaign finance reforms; impose term limits and retirement age requirements on federal judges, including Supreme Court justices; create an independent Government Accountability and Performance Commission; abolish the Electoral College; end gerrymandering and the Senate filibuster; overhaul of the U.S. House and Senate to ensure greater accountability and more equal representation; impose 24-year term limits on members of the U.S. House and Senate; and streamline our Constitution’s amendment process so that it is no longer virtually impossible to update our national charter.
I am passionate about: protecting everyone’s personal rights and freedoms, including women’s reproductive rights; offering Medicare to all who want and need it; urgently and aggressively tackling climate change; expanding Social Security benefits for low-income retirees; increasing investments in education, infrastructure, and scientific research; providing universal pre-kindergarten and aftercare; bolstering national security and public safety (including stricter gun safety laws and regulations).
Honesty.
That genuine democracy is worth fighting for...
President John F. Kennedy's visit to the University of Maine in October 1963. I was three years old at the time.
Ground work laborer/handyman assistant.
Les Miserables. It's such a compelling story about redemption and justice.
Ned Stark
Reforming our governing institutions and practices so that we better protect everyone's rights and more adequately address such pressing problems as climate change, uneven economic prosperity, inadequate health care, shoddy infrastructure, under performing schools, increasing gun violence, and insufficient retirement security.
I support House and Senate term limits (24 years). Twenty-four years should be sufficient.
I am concerned that it is insufficiently democratic and in need of a significant structural overhaul.
Yes.
It should be eliminated.
Cordial working relationships.
Yes.
That the candidate is adequately qualified for the position.

Note: Ballotpedia reserves the right to edit Candidate Connection survey responses. Any edits made by Ballotpedia will be clearly marked with [brackets] for the public. If the candidate disagrees with an edit, he or she may request the full removal of the survey response from Ballotpedia.org. Ballotpedia does not edit or correct typographical errors unless the candidate's campaign requests it.

Campaign website

Costello’s campaign website stated the following:

“

A Summary of David's Key Public Policy Priorities

As Maine's Senator, David will work to help in advancing a number of very important administrative reforms and legislative initiatives, many of which are summarized below.

Expanding Economic Prosperity

David will help in fostering a thriving economy and broader prosperity by supporting efforts to:

  • Provide universal pre-kindergarten and aftercare.
  • Expand workforce training and apprenticeships.
  • Increase performance-aligned resources for our schools, colleges, students, and teachers.
  • Boost investments in transportation, energy, and communications infrastructure.
  • Spur scientific research and development (R&D).
  • Raise the federal minimum wage and increase federal Child and Earned Income Tax Credits.
  • Expand sustainable community and affordable housing development assistance.
  • Increase personal investment and savings incentives – retirement and non-retirement.
  • Reallocate large agri-business and fossil fuel subsidies to rural economic development and clean energy initiatives.
  • Raise adequate revenue and ensure tax fairness via the enactment of progressive tax reforms.
  • Establish a global minimum corporate tax and enhanced labor and environment protections.

Health Care

David will help in guaranteeing adequate and affordable health care by supporting efforts to:

  • Offer Medicare, including dental and vision care, to all who want it.
  • Improve existing Affordable Care Act and other federal healthcare provisions for those who choose not to enroll in Medicare.

Adequately Addressing Climate Change

David will help in adequately addressing climate change by supporting efforts to:

  • Develop and implement an aggressive national, science-based climate action plan that includes, among other components: strict greenhouse gas (GHG) emissions caps; ambitious GHG sequestration and "draw down" goals and actions; expanded clean energy, clean transportation, and energy efficiency initiatives; smarter development and land use regulations; greener appliance and building construction standards; and increased funding to mitigate the growing impacts of climate change.

Protecting Our Environment

​David will help in further protecting our environment by supporting efforts to:

  • Enact more stringent air and water quality standards and regulations.
  • Require courts to defer to federal agencies when rules they make are reasonable and enabling laws are ambiguous (codify Chevron deference).
  • Preserve more places of natural beauty and ecological importance.
  • Enact smarter, more sustainable development laws and regulations.
  • Develop and implement a national Zero Waste plan to reduce, reuse, or eliminate hazardous and solid waste in the U.S.
  • Enact stricter land and water conservation laws and regulations.

Ensuring Civil,Civic, and Human Rights

​David will help in expanding our nation's civil, civic, and human rights by supporting efforts to:

  • Protect the reproductive rights of women and the civil rights of everyone, including LGBTQIA+ persons.
  • Approve the Equal Rights Amendment (ERA).
  • Enact the John Lewis Voting Rights Act.

Enhancing Retirement Security

David will help in strengthening Social Security and overall retirement security by supporting efforts to:

  • Raise the FICA payroll tax cap.
  • Provide increased benefits to low-income retirees.
  • Establish a sovereign wealth fund to help in funding Social Security and Medicare.
  • Back the expansion of government incentivized retirement savings and investment accounts for working- and middle-class Americans to supplement Social Security.

Strengthening National Security

David will help in bolstering national security by supporting efforts to:

  • Maintain military and intelligence gathering superiority over all potential rivals, especially China and Russia.
  • Prioritize nuclear and conventional arms control agreements.
  • Expand military and intelligence gathering alliances.
  • Strengthen trade and foreign policy agencies and agreements.
  • Become more fully, intelligently, and responsibly engaged in world affairs.
  • Boost our nation's overall global economic competitiveness.

Enhancing Public Safety

David will help in enhancing public safety by supporting efforts to:

  • Increase funding for community policing, substance abuse, and mental health services.
  • Focus increased investigative and prosecutorial resources on violent offenses.
  • Enhance police training and accountability.
  • Build on recent common-sense gun safety laws and regulations.

Advancing Comprehensive Immigration Reform

​David will help in addressing our nation’s immigration challenges by supporting efforts to:

  • Pass comprehensive immigration reforms that facilitate legal immigration and aid in resolving our nation’s growing worker shortages.[2]
 ”
—David Costello’s campaign website (2024)[3]

Campaign finance summary

Note: The finance data shown here comes from the disclosures required of candidates and parties. Depending on the election or state, this may represent only a portion of all the funds spent on their behalf. Satellite spending groups may or may not have expended funds related to the candidate or politician on whose page you are reading this disclaimer. Campaign finance data from elections may be incomplete. For elections to federal offices, complete data can be found at the FEC website. Click here for more on federal campaign finance law and here for more on state campaign finance law.

David Costello campaign contribution history
YearOfficeStatusContributionsExpenditures
2026* U.S. Senate MaineCandidacy Declared general$19,873 $5,121
2024* U.S. Senate MaineLost general$111,308 $111,627
Grand total$131,181 $116,748
Sources: OpenSecrets,  Federal Elections Commission ***This product uses the openFEC API but is not endorsed or certified by the Federal Election Commission (FEC).
* Data from this year may not be complete

See also

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External links

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    Footnotes

    1. ↑ Information submitted to Ballotpedia through the Candidate Connection survey on August 30, 2023
    2. ↑ Note: This text is quoted verbatim from the original source. Any inconsistencies are attributable to the original source.
    3. ↑ Costello for Senate, “Policy Priorities,” accessed September 19, 2024


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