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Race2026 cycle · RunoffsPrimary day 9 Jun 2026Updated

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DonorAlpha, “Maine Senate primary 2026”, https://donoralpha.com/races/maine-senate-primary-2026?e=c2026&el=runoff, updated .

Maine Senate primary 2026

No. 28 of 68 Senate races in the 2026 cycle

This race is 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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