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Race2026 cycle · PrimariesPrimary day 9 Jun 2026Updated

Cite this page

DonorAlpha, “Maine Senate primary 2026”, https://donoralpha.com/races/maine-senate-primary-2026, updated .

Maine Senate primary 2026

No. 12 of 34 Senate races in the 2026 primaries

The short version

In the 2026 Maine Senate primary, 18 outside groups spent $6.2M: $154K supporting Graham Platner (D), $4.2M opposing Graham Platner, $1.7M supporting Susan Collins (R) and $37,863 opposing Susan Collins.

The result, as reported final count

  • DemocraticGraham Platner72.1%Won
  • RepublicanSusan Collins100.0%Won

In the 2026 Maine Senate primary, Graham Platner won the Democratic ballot with 72.1% of the vote and Susan Collins won the Republican ballot with 100.0% of the vote.

$6.2M

outside money

supporting Graham Platner (D)
$154K
opposing Graham Platner (D)
$4.2M
supporting Susan Collins (R)
$1.7M
opposing Susan Collins (R)
$37,863

Outside money supporting and opposing each candidate

Both sides on one scale
← OpposingSupporting →

  • Graham Platner Democrat

    $4.2M
    $154K

    $154K supporting Graham Platner · $4.2M opposing Graham Platner

  • Susan Collins Republican

    $37,863
    $1.7M

    $1.7M supporting Susan Collins · $37,863 opposing Susan Collins

  • Janet Mills Democrat

    $8,952

    $8,952 supporting Janet Mills

The long version

The candidates

What each candidate’s own campaign raised, beside what outside groups spent supporting and opposing them.

  • Graham Platner

    Democrat

    Own campaign raised
    $21.1M
    Outside money supporting
    $154K
    Outside money opposing
    $4.2M
    Graham for Maine

  • Susan Collins

    Republican

    Own campaign raised
    $16.2M
    Outside money supporting
    $1.7M
    Outside money opposing
    $37,863
    Collins for Senator

  • Janet Mills

    Democrat

    Own campaign raised
    $6.1M
    Outside money supporting
    $8,952
    Mills for Maine

  • Andrea Laflamme

    Democrat

    Own campaign raised
    $16,254
    Laflamme for Me
  • Campaign money to 30 Jun 2026

Week by week

Outside money each week, supporting and opposing the candidates, all candidates combined.

Week of 8 Jun 2026

Opposing $250K

Supporting candidatesOpposing candidates

The groups on each side

The biggest outside groups in this race, by what they spent supporting or opposing each candidate.

Spent supporting a candidate

  1. Senate Leadership Fundsupporting Susan Collins$626K
  2. Lead Maine Committeesupporting Susan Collins$474K
  3. Clearpath Action Fundsupporting Susan Collins$338K
  4. Stronger Mainesupporting Susan Collins$288K
  5. Maine Peoplesupporting Graham Platner$96,485
  6. National Nurses United for Patient Protectionsupporting Graham Platner$50,606
  7. Forward Bluesupporting Graham Platner$5,612
  8. Blue Shift PACsupporting Janet Mills$5,479

Spent opposing a candidate

  1. Pine Tree Results PACopposing Graham Platner$4.0M
  2. Senate Leadership Fundopposing Graham Platner$250K
  3. NRRCopposing Susan Collins$36,250
  4. Field Team 6opposing Susan Collins$1,271
  5. Planned Parenthood Votesopposing Susan Collins$342

Who’s connected to whom

The groups that spent supporting or opposing the candidates.

Their biggest giversGroups that spentCandidatesPine Tree Results PAC spent $4.0M opposing Graham Platner · $4.0MSenate Leadership Fund spent $626K supporting Susan Collins · $626KLead Maine Committee spent $474K supporting Susan Collins · $474KClearpath Action Fund spent $338K supporting Susan Collins · $338KStronger Maine spent $288K supporting Susan Collins · $288KSenate Leadership Fund spent $250K opposing Graham Platner · $250KMaine People spent $96,485 supporting Graham Platner · $96,485National Nurses United for Patient Protection spent $50,606 supporting Graham Platner · $50,606NRRC spent $36,250 opposing Susan Collins · $36,250Stronger America (TX) gave $3.0M to Pine Tree Results PAC · $3.0MLexington Fund (TX) gave $1.3M to Pine Tree Results PAC · $1.3MOne Nation gave $70.7M to Senate Leadership Fund · $70.7MChevron Corporation gave $3.9M to Senate Leadership Fund · $3.9MClearpath Action for Conservative Energy gave $4.0M to Clearpath Action Fund · $4.0MStronger America (VA) gave $1.4M to Stronger Maine · $1.4MCommon Sense Leadership Fund gave $500K to Stronger Maine · $500KNNU gave $2.5M to National Nurses United for Patient Protection · $2.5MStronger America (TX)Stronger America (TX)Company or group · $3.0MLexington Fund (TX)Lexington Fund (TX)Company or group · $1.3MOne NationOne NationCompany or group · $70.7MChevron CorporationChevron CorporationCompany or group · $3.9MClearpath Action forConservative EnergyClearpath Action for Conservative EnergyCompany or group · $4.0MStronger America (VA)Stronger America (VA)Company or group · $1.4MCommon Sense Leadership FundCommon Sense Leadership FundCompany or group · $500KNNUNNUCompany or group · $2.5MPine Tree Results PACPine Tree Results PACGroup · $4.0MSenate Leadership FundSenate Leadership FundGroup · $876KLead Maine CommitteeLead Maine CommitteeGroup · $474KClearpath Action FundClearpath Action FundGroup · $338KStronger MaineStronger MaineGroup · $288KMaine PeopleMaine PeopleGroup · $96,485National Nurses United forPatient ProtectionNational Nurses United for Patient ProtectionGroup · $50,606NRRCNRRCGroup · $36,250Graham PlatnerGraham PlatnerCandidate · $4.4MSusan CollinsSusan CollinsCandidate · $1.8MJanet MillsJanet MillsCandidate · $8,952
  • Pine Tree Results PAC spent opposing Graham Platner · $4.0M
  • Senate Leadership Fund spent supporting Susan Collins · $626K
  • Lead Maine Committee spent supporting Susan Collins · $474K
  • Clearpath Action Fund spent supporting Susan Collins · $338K
  • Stronger Maine spent supporting Susan Collins · $288K
  • Senate Leadership Fund spent opposing Graham Platner · $250K
  • Maine People spent supporting Graham Platner · $96,485
  • National Nurses United for Patient Protection spent supporting Graham Platner · $50,606
  • NRRC spent opposing Susan Collins · $36,250
  • Stronger America (TX) gave to Pine Tree Results PAC · $3.0M
  • Lexington Fund (TX) gave to Pine Tree Results PAC · $1.3M
  • One Nation gave to Senate Leadership Fund · $70.7M
  • Chevron Corporation gave to Senate Leadership Fund · $3.9M
  • Clearpath Action for Conservative Energy gave to Clearpath Action Fund · $4.0M
  • Stronger America (VA) gave to Stronger Maine · $1.4M
  • Common Sense Leadership Fund gave to Stronger Maine · $500K
  • NNU gave to National Nurses United for Patient Protection · $2.5M
GaveSpent supportingSpent opposingSwipe to see the whole map.

Group

Pine Tree Results PAC

  • Pine Tree Results PAC spent $4.0M opposing Graham Platner$4.0M
  • Stronger America (TX) gave $3.0M to Pine Tree Results PAC$3.0M
  • Lexington Fund (TX) gave $1.3M to Pine Tree Results PAC$1.3M
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