Polling Average
80%60%40%20%0%
55.9%
29.7%
Maine Democratic Senate nominee?
$6.0M
JUN 10, 2026Primary Election
Party selects its nominee.
Overview
Current roleGovernment official
PartyDemocratic
Political ideologyProgressive Democrat
LocationMaine
BackgroundGovernment official
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EducationOld Town High School (graduate)
Notable personal detailsDavid Allen Costello is a Maine Democratic candidate for the U.S. Senate, based in Brunswick. He has worked in senior-level roles in state and federal government, including environmental and climate policy positions in Maryland government, and has experience working for the U.S. government abroad. He is a graduate of Old Town High School and earned a B.A. from George Washington University and an M.Sc. from the London School of Economics.
SourcesShowHide
pressherald.comcostelloforsenate.comen.wikipedia.orgballotready.orgtwitter.comballotwire.comwinthropmaine.govbrunswickme.govgopknoxcounty.comchess.comptindirectory.comwashingtonpost.comivoterguide.comuselectionatlas.orghomes.comfalmouthme.orgnasba.orgclerk.house.govlwvme.orglinkedin.comwmtw.comontheissues.orgdemocracyinaction.usmainemorningstar.comfec.govpoliticspa.commainepublic.orgfacebook.comkomonews.comballotpedia.orgnewtonbeacon.orgwashingtontimes.comwrvo.orginstagram.comvotesmart.orgorganizations.ballotready.orgjustfacts.votesmart.orgcdn.ballotpedia.org
Positions
LiberalConservative
Economy & Taxes
Supports increasing taxes on wealthy individuals and corporations, expanding tax credits and incentives for low- and middle-income people and small businesses, and using tax changes to fund expanded government programs and investments (infrastructure, R&D, housing, Social Security/Medicare protection). Advocates a global minimum corporate tax and reallocating subsidies from large agribusiness and fossil fuels to rural and clean-energy initiatives.
Healthcare
Supports expanding access to government-provided coverage by offering Medicare (including dental and vision) to anyone who wants it, improving the Affordable Care Act for those who do not enroll in Medicare, and increasing funding for substance use and mental health services.
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Immigration & Border
Supports comprehensive immigration reform that secures borders while facilitating legal immigration and addressing worker shortages; emphasizes enactment of reforms to expand legal pathways alongside border security measures.
Abortion & Reproductive Rights
Supports protecting women’s reproductive rights, including codifying Roe v. Wade and increasing funding for organizations like Planned Parenthood. Backs actions to protect reproductive health decisions and broader civil rights protections.
Climate & Energy
Supports an aggressive, science-based national climate action plan with strict greenhouse gas emissions caps, large clean energy and efficiency investments, GHG sequestration goals, and reallocation of fossil-fuel subsidies toward clean energy. Backs policies such as a carbon tax and expanded renewable development (wind, solar, hydro) while urging protections for affected communities and fisheries.
Public Safety & Guns
The candidate supports stronger federal gun safety laws including universal background checks, safe storage requirements, bans on military-style/assault weapons, red flag measures, and increased funding for mental health and community policing; he also supports stricter sentencing for gun-related crimes while saying he would not deny responsible citizens the right to own guns.
Polls
Maine Democratic Senate nominee?
Aggregation source: FiftyPlusOne
Fundraising
Latest report: Cycle 2026Total raisedCash on hand
$149.7K
$112.2K
$74.8K
$37.4K
$0
2024
2026
LatestYear
Total raised
Cash on hand
Total spent
Burn rate
Cycle 2024
$111.3K
$0.00
$111.6K
$4.7K
Cycle 2026
$149.7K
$41.8K
$107.9K
$6.3K
Source: FEC
New updates coming soon
We're monitoring and will update when new data impacts the race.
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