John J. Mahoney
Massachusetts State Representative, District 154 since 2010. Ran in 9 elections between 2010 and 2024, winning 9. Re-elected in 2026. Next on the ballot in 2028.
- In office
- 16 yrs
- Since 2010
- Bills became law
- 0
- 9 sponsored, 2025–2026 session
- Votes missed
- 1.7%
- Chamber median 0.9%
- With party
- 100%
- On votes splitting the parties
- Last margin
- +37.2
- Won 2014
- Next election
- 2028
- Nov 7, 2028
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 1:51 PM ET
Committees
As of 2026-10.
- Post Audit and Oversight · chair
- Human Resources and Employee Engagement
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
No bills in this list for the 2025–2026 session.
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where Mahoney sits in the Massachusetts House of Representatives
Mahoney is closer to the center than 11% of the chamber's Democrats.
Closest: Jay Livingstone, Jessica Giannino, Kristin Kassner
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:51 PM ET
With Mahoney’s party
- Votes with the chamber's Democrats100%
- Cosponsorships of the other party's bills0%
Black tick: the average of Democrats in the Massachusetts House of Representatives.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: Mahoney’s vote, each party’s majority, and the result. An orange vote differs from most Democrats.
| Date | Bill | Mahoney | Dem. majority | Rep. majority | Result |
|---|---|---|---|---|---|
| Jul 22, 2026 | H 5595: An Act prioritizing patient access to care | Yes | Yes | No | Passed 119–33 |
| Jul 8, 2026 | H 5562: An Act relative to economic development in the commonwealth | Yes | Yes | Yes | Passed 145–6 |
| Jul 1, 2026 | H 5555: An Act making appropriations for the fiscal year 2027 for the maintenance of the… | Not voting | Yes | Yes | Passed 142–6 |
| Jun 10, 2026 | S 2726: An Act regarding free expression | No | No | Yes | Failed 23–133 |
| Apr 28, 2026 | H 5500: An Act making appropriations for the fiscal year 2027 for the maintenance of the… | Yes | Yes | No | Passed 136–20 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time Mahoney was on a ballot. Filled marks are general elections won; hollow marks are primaries; an orange outline is a loss.
Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Elections
Margin against the seat’s presidential baseline: how the seat voted for president in the same or nearest year.
| Year | Race | Result | Margin | Seat | +/− |
|---|---|---|---|---|---|
| 2026 | Massachusetts House of Representatives, District 154 | Won | — | D+33.9 | — |
| 2024 | Massachusetts House of Representatives, District 154 | Won | — | D+33.9 | — |
| 2022 | Massachusetts House of Representatives, District 154 | Won | — | D+40.8 | — |
| 2020 | Massachusetts House of Representatives, District 215 | Won | — | — | — |
| 2018 | Massachusetts House of Representatives, District 215 | Won | — | — | — |
| 2016 | Massachusetts House of Representatives, District 215 | Won | — | — | — |
| 2014 | Massachusetts House of Representatives, District 215 | Won | D+37.2 | — | — |
| 2014 | Massachusetts House of Representatives, District 215 (primary) | Won | — | — | — |
| 2012 | Massachusetts House of Representatives, District 215 | Won | — | — | — |
| 2010 | Massachusetts House of Representatives, District 154 | Won | D+20.3 | — | — |
Source: 99chambers results archive; 2026: civicAPI (unofficial)Updated Nov 8, 2026, 7:01 PM ET
Campaign money, 2025–26
- Raised
- $61.6K
- Spent
- $60.1K
- Cash
- $22.8K
Source: Massachusetts Office of Campaign and Political Finance filings through Sep 30, 2026Updated Oct 31, 2026, 6:19 PM ET
Campaign committees
Open committees can still raise and spend money.
| Mahoney Committee State | Active |
Source: Massachusetts Office of Campaign and Political Finance filings through Sep 30, 2026Updated Oct 31, 2026, 6:19 PM ET
Seats Mahoney has held
- Massachusetts House of Representatives, District 154 · since 2022
- Massachusetts House of Representatives, District 215 · since 2012
- Massachusetts House of Representatives, District 154 · since 2010
Source: 99chambers results archive
Who Mahoney has run against
- Jacqueline Gisela Kostas (R) · 2014 election, won
- Paul J. Franco (R) · 2010 election, won
Source: 99chambers results archive; 2026: civicAPI (unofficial)
How we know Mahoney
One person, matched across every source we use.
- Open States ocd-person/2abbc0cb-6339-42d9-9947-69412a24301b
- Wikidata Q6241148
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 1:51 PM ET