Polling Average
40%30%20%10%0%
18.3%
27.9%
21.5%
Republican
Brian Shortsleeve
Republican candidate for Governor in Massachusetts
Massachusetts Republican Governor nominee?
$46.6K
SEP 16, 2026Primary Election
Party selects its nominee.
Live Odds — Massachusetts Republican Governor nominee?
Current prediction-market probability for the candidate, updated as market prices change.
5.4%chance to win
$46.6KSEP 16, 2026Candidate Overview
Key details about the candidate’s background, party, office sought and current campaign.
Current roleFounder, M33 Growth
PartyRepublican
Political ideologyConservative Republican
GenderMale
LocationMassachusetts
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BackgroundFounder, M33 Growth
EducationHarvard College
Notable personal detailsBrian Shortsleeve is a Republican candidate for Governor of Massachusetts in 2026 and the founder of M33 Growth. He previously served in senior leadership roles at the Massachusetts Bay Transportation Authority, including Chief Administrator and Acting General Manager during the Charlie Baker administration. He is a U.S. Marine Corps officer veteran and is a Massachusetts native.
SourcesShowHide
brianshortsleeve.comwbur.orgcbsnews.comwcvb.commalegislature.govlinkedin.commassgop.commbtaadvisoryboard.orgwgbh.orghistory.house.govpatch.commassdailynews.combostonglobe.comen.wikipedia.orgsuffolk.eduocpf2.blob.core.windows.netbhfs.comctps.orgreddit.comnbcboston.combrianlabrie.comradioworcester.compeople.equilar.cominstagram.combostonherald.comcommonwealthbeacon.orgwamc.orgboston.commasslive.compro.stateaffairs.comwikidata.orgvotesmart.orgcdn.ballotpedia.orgstatic.votesmart.orgdeveloper.ballotpedia.orgballotready.orgnga.orgfec.govcommerce.senate.gov
Political Positions
LiberalConservative
Economy & Taxes
The candidate advocates for significant tax cuts (including a phased income-tax reduction and lower sales tax), opposes any new taxes, supports spending caps and protections for Prop 2½, and emphasizes reducing government spending and regulation to restore affordability and competitiveness.
Healthcare
The candidate supports reducing state government healthcare spending and exploring cuts to the state Medicaid program while opposing new taxes or surcharges on prescription drugs. He emphasizes fiscal restraint across state programs and prioritizes veterans’ access to mental health care and services. Overall his stated approach favors spending reductions and limiting new healthcare-related taxes or fees rather than expanded public coverage.
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Immigration & Border
The candidate supports stricter enforcement and cooperation with federal immigration authorities, opposes sanctuary-state policies, and favors restricting state shelter programs for migrants while endorsing deportation of serious offenders. He frames the current situation as a migrant crisis driven by permissive state policies and calls for reforms to reduce migrant intake and increase cooperation with ICE.
Climate & Energy
Supports an all-of-the-above energy strategy prioritizing affordability and reliability, opposes what he calls costly climate mandates and surcharges, and advocates building natural gas pipeline infrastructure to lower consumer energy costs.
Public Safety & Guns
The candidate emphasizes support for lawful gun owners and responsible gun ownership while opposing new registries, broad restrictions, and measures he views as infringing on the Second Amendment. He calls for enforcing existing gun laws, faster prosecution of gun-related crimes, due-process protections in licensing, and stronger public-safety measures that back law enforcement.
Latest News
AINews Summary
Last updatedAug 10, 2026
Brian Shortsleeve is in the middle of a tense Massachusetts Republican governor primary against Mike Minogue. He has faced backlash from party leaders over a statewide attack ad, while Minogue has recently launched an affordability-focused ad campaign and appears to have the fundraising and polling edge. Shortsleeve has also boosted his own campaign with $600,000 of personal money and remains on the ballot after pressure to drop out. He has named Shawn Oliver as his running mate for the race.
brianshortsleeve.com+38
Articles
TBThe Boston Herald14 days ago
MassGOP, RNC committee members blast Shortsleeve for TV attack ad against Minogue
Negative
TBThe Boston Herald2 months ago
Kennealy endorses Mike Minogue in gubernatorial race
Neutral
TBThe Boston Herald2 months ago
Shortsleeve injects $600K of his own money into his campaign
Positive
TBThe Boston Globe3 months ago
Mike Minogue and Brian Shortsleeve should have compete in GOP primary
Positive
Latest Polls
Massachusetts Republican Governor nominee?
Recent polling results and the candidate's current average in the race.
Brian Shortsleeve currently averages 18.3%, ranking third in this race, 3.2 points behind the next candidate.
Polling average: 18.3%Position: thirdMargin: -3.2 ptsLatest poll: 15.0% (Jun 18 - 23)Polls included: 6
Average recalculated from polls through Jun 18 - 23.
Aggregation source: FiftyPlusOne
New updates coming soon
We're monitoring and will update when new data impacts the race.
- Endorsements
- Fundraising