Jason Plummer
Illinois State Senator, District 55 since 2018. Next on the ballot in 2028.
- In office
- 7 yrs
- Since 2018
- Bills became law
- 1
- 45 sponsored, 2025–2026 session
- Votes missed
- 2.4%
- Chamber median 2.8%
- With party
- 99%
- On votes splitting the parties
- Last margin
- +40.0
- Won 2018
- Next election
- 2028
- Nov 7, 2028
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET
Committees
As of 2026-10.
- Executive Appointments · republican spokesperson
- Financial Institutions · republican spokesperson
- Appropriations-Public Safety and Infrastructure
- Commerce
- Environment and Conservation
- Health and Human Services
- Insurance
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where Plummer sits in the Illinois State Senate
Plummer is closer to the center than 11% of the chamber's Republicans.
Closest: Neil Anderson, Chapin Rose, Andrew Chesney
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:50 PM ET
With Plummer’s party
- Votes with the chamber's Republicans99%
- Cosponsorships of the other party's bills42%
Black tick: the average of Republicans in the Illinois State Senate.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: Plummer’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.
| Date | Bill | Plummer | Rep. majority | Dem. majority | Result |
|---|---|---|---|---|---|
| May 31, 2026 | HB 5090: PROCUREMENT-CONSTRUCTION | No | No | Yes | Passed 42–12 |
| May 31, 2026 | HB 4379: ADULT CHANGING STATIONS | No | No | Yes | Passed 46–12 |
| May 31, 2026 | HB 4571: COUNTIES CD-AFFORDABLE HOUSING | No | No | Yes | Passed 44–14 |
| May 29, 2026 | HB 4758: JOB APPLICATION-DRIVER LICENSE | No | No | Yes | Passed 41–15 |
| May 29, 2026 | HB 4339: SCH CD-HIGH SCH-REGISTER VOTER | No | No | Yes | Passed 41–12 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time Plummer 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 |
|---|---|---|---|
| 2024 | Illinois State Senate, District 55 | Won | — |
| 2022 | Illinois State Senate, District 55 | Won | — |
| 2018 | Illinois State Senate, District 54 | Won | R+40.0 |
| 2012 | U.S. House, IL-12 | Lost | D+8.9 |
Source: 99chambers results archive
Seats Plummer has held
- Illinois State Senate, District 55 · since 2022
- Illinois State Senate, District 54 · since 2018
Source: 99chambers results archive
Who Plummer has run against
- Brian Stout (D) · 2018 general, won
- William L. Enyart (D) · 2012 general, lost
Source: 99chambers results archive
How we know Plummer
One person, matched across every source we use.
- Open States ocd-person/d868bc8f-f51c-4f5b-a9a3-3608b8b44b29
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET