David Costello Maine, Bio, Age, Family, Senate Race, Policies & Net Worth

Who is David Costello? | Biography

David Costello is an American public policy expert and Democratic candidate running for the U.S. Senate in Maine. He is a 2026 Democratic contender challenging incumbent Susan Collins. He entered the race to promote government reform, economic fairness, and stronger democratic institutions.

Costello grew up in Maine and developed early interest in public service and civic engagement. Moreover, he comes from a working-class background in Old Town, which he often highlights in his political messaging. He later built a long career in government administration, working across state, federal, and international programs. In addition, he served in senior roles in the Maryland Department of Education and with U.S. foreign assistance programs.

Professionally, Costello has more than 30 years of experience in public service and policy management. Furthermore, he worked as a senior aide in government institutions and participated in national and international development projects. He also contributed to education reform and public administration efforts in multiple states.

In the 2026 Maine Senate race, David Costello positions himself as a reform-focused Democrat. His campaign prioritizes healthcare expansion, climate action, voting rights protection, and economic equality. Additionally, he supports Medicare expansion, stronger labor protections, and campaign finance reform.

Costello also advocates structural political reforms such as banning gerrymandering and increasing transparency in federal elections. Moreover, he emphasizes rebuilding public trust in government institutions through accountability measures. As a result, his platform appeals to voters seeking institutional reform and experienced leadership.

Overall, David Costello presents himself as an experienced government administrator with a long record in public policy. Therefore, his 2026 Senate campaign focuses on reforming Washington and strengthening democratic governance in the United States.

David Costello Age | How Old is David Costello?

David Costello is 65 years old as of 2026. He was born on November 12, 1960, in Bangor, Maine. Moreover, he grew up in Old Town in a working-class family raised by his mother and grandparents. His early life shaped his strong focus on public service and government reform. In addition, he built a long career across local, state, federal, and international roles. Therefore, Costello now runs as a Democratic candidate in Maine’s 2026 U.S. Senate race with decades of experience.

David Costello Height | How Tall is David Costello?

David Costello is approximately 6 feet 1 inch (185 cm) tall. This height has been consistently reported in campaign-related public descriptions and candidate profile references. Moreover, he is a 2026 Democratic candidate in Maine’s U.S. Senate race. In addition, official biographies focus mainly on his extensive government service rather than physical attributes. He was born in Bangor and raised in Old Town, Maine. Therefore, his campaign emphasizes policy experience, public service, and reform leadership rather than personal physical details or appearance.

David Costello Political Party | Is David Costello Democrat or Republican?

David Costello is a member of the Democratic Party. He runs as a Democratic candidate in the 2026 U.S. Senate race in Maine. Moreover, he aligns with progressive and reform-minded Democratic values focused on healthcare, education, and economic fairness. In addition, his campaign emphasizes government accountability and voting rights protection. He also supports labor rights and environmental policies. Therefore, Costello positions himself as a pragmatic Democrat aiming to challenge Republican incumbent Susan Collins in the 2026 Senate election.

David Costello Education

David Costello has a strong academic background in public policy and international studies. He earned a Bachelor’s degree from the University of Maine. Moreover, he completed graduate studies at George Washington University and the London School of Economics and Political Science (LSE). His education focused on public administration, global affairs, and policy development. In addition, he built professional expertise through government and international service roles. Therefore, his academic training supports his long career in public service. Furthermore, Costello applies this experience directly to his 2026 Maine U.S. Senate campaign, emphasizing education access, economic fairness, and government reform.

David Costello Wife | Is David Costello married?

David Costello is married and lives with his wife and family in Brunswick, Maine. According to his official campaign biography, he resides with his wife, children, and their beagle Stella. Moreover, Costello keeps his family life largely private while focusing on his public service career. In addition, he highlights his long experience in government, education, and international development in his Senate campaign. Therefore, his personal life remains secondary to his political platform. Consequently, public information confirms he has a wife but provides limited personal details.

David Costello Children | Kids

David Costello is a father and lives with his family in Brunswick, Maine. According to his official campaign biography, he resides with his wife and children. Moreover, he keeps his family life relatively private while focusing on his long career in public service. In addition, Costello emphasizes his government experience, education policy work, and international development background in his Senate campaign. Therefore, his personal life remains secondary to his political platform. Consequently, public records confirm he has children, but details about them remain undisclosed.

David Costello Family | Parents, Siblings, and Early Life in Maine

David Costello grew up in a working-class family in Old Town, Maine. He was born in Bangor and raised by his mother Gail and maternal grandparents Alfred and Pauline Pelletier Baillargeon. Moreover, his father, John, was an Army veteran and labor organizer who died when Costello was young. In addition, he does not have full siblings and comes from a close extended family background. Furthermore, his upbringing shaped his commitment to public service and labor rights. Therefore, Costello often credits his family’s working-class struggles for influencing his political values and 2026 U.S. Senate campaign.

David Costello Maine Senate Race 2026 | Primary Results | Campaign, & Election Update

The 2026 Maine U.S. Senate race features a competitive Democratic primary shaping the general election against Republican incumbent Susan Collins. David Costello is a Democratic candidate in Maine’s 2026 U.S. Senate primary. He runs as a long-time public service reform advocate focused on government accountability, healthcare access, and economic fairness. Moreover, he positions himself as an experienced alternative within the Democratic field.

The Democratic primary includes several notable contenders. Graham Platner, an oyster farmer and Marine veteran, leads polling and fundraising in the race. Meanwhile, Janet Mills, the outgoing governor, suspended her active campaign but remains on the ballot under election rules. In addition, Costello remains in the race alongside other Democratic challengers, emphasizing institutional reform and policy expertise.

As the June 9, 2026 primary approaches, the race has tightened around Platner as the frontrunner, while Costello continues outreach focused on voters seeking experienced governance. Furthermore, the election uses ranked-choice voting, which could influence final outcomes through coalition-building among candidates. Ultimately, the winner will face Susan Collins in a high-stakes November general election that may determine Senate control.

David Costello Policies and Political Views | Maine U.S. Senate Campaign Platform

The 2026 Maine U.S. Senate race is shaping up as one of the most competitive elections in the state. David Costello is a Democratic candidate in the 2026 Maine U.S. Senate election. He runs on a reform-focused platform emphasizing democracy protection, economic fairness, and government accountability. Moreover, he highlights his 30-plus years of public service experience in federal, state, and international roles as a key qualification.

Costello’s policy views center on strengthening democratic institutions and expanding public services for Maine residents. In addition, he supports Medicare expansion, improved Social Security protections, and broader healthcare access for working families. He also advocates for climate action, clean energy investment, and stronger environmental regulations. Furthermore, he pushes for voting rights protections, campaign finance reform, and anti-gerrymandering measures to improve electoral fairness. Overall, his campaign positions him as a pragmatic progressive focused on institutional reform and long-term economic stability for Maine voters.

David Costello Career | Government Service, USAID Work, & Maine U.S. Senate Candidate

David Costello has built a 30-year career in public service across local, state, federal, and international government roles. He began his political involvement in his late teens while working on campaigns and joining Senator Ted Kennedy’s national field staff. Moreover, he developed early experience in elections, policy, and governance reform.

In addition, Costello worked in Maine government supporting elections, campaign finance, and administrative reforms. He later served in international development with USAID, managing programs in conflict-affected regions including Bosnia, Haiti, and Cambodia. Furthermore, he held senior leadership roles in Baltimore city government and the Maryland state administration. Today, Costello applies this extensive experience to his 2026 Maine U.S. Senate campaign, focusing on governance reform, public accountability, and policy-driven leadership.

David Costello Net Worth 2026

David Costello’s estimated net worth is approximately $5.57 million as of 2026. Public financial analysis sources estimate this figure based on available disclosures and asset tracking reports. Moreover, he earned income through a long career in public service across federal, state, and international roles. In addition, he worked with USAID and state government agencies in leadership positions. Therefore, his financial profile reflects decades of government service. Consequently, Costello enters the 2026 Maine U.S. Senate race as an experienced and financially established public policy professional.

Biography Summary