Rosemary Bayer
Michigan State Senator, District 13 since 2018. Did not run for re-election in 2026; leaves office in January 2027.
- In office
- 7 yrs
- Since 2018
- Bills became law
- 0
- 55 sponsored, 2025–2026 session
- Votes missed
- 1.3%
- Chamber median 1.5%
- With party
- 97%
- On votes splitting the parties
- Last margin
- +14.3
- Won 2022
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET
Committees
As of 2026-10.
- Administrative Rules
- Appropriations
- Energy and Environment
- Finance, Insurance and Consumer Protection
- Housing and Human Services
- Local Government
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 Bayer sits in the Michigan State Senate
Bayer is closer to the center than 80% of the chamber's Democrats.
Closest: Kevin Hertel, Jeremy Moss, Sam Singh
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:53 PM ET
With Bayer’s party
- Votes with the chamber's Democrats97%
- Cosponsorships of the other party's bills17%
Black tick: the average of Democrats in the Michigan State Senate.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: Bayer’s vote, each party’s majority, and the result. An orange vote differs from most Democrats.
| Date | Bill | Bayer | Dem. majority | Rep. majority | Result |
|---|---|---|---|---|---|
| Sep 9, 2026 | HB 5482: State agencies (existing): generally; plans to correct audit recommendations; require… | Yes | Yes | No | Passed 24–10 |
| Sep 9, 2026 | SB 729: State finance: authorities; outstanding obligations of the state building authority;… | Yes | Yes | No | Passed 24–10 |
| Jul 3, 2026 | SB 1052: Human services: medical services; definition of kickbacks or bribes; modify. Amends sec.… | Yes | Yes | No | Passed 22–14 |
| Jul 3, 2026 | SB 569: Health: funding; various fees under the public health code; transfer and deposit into the… | Yes | Yes | No | Passed 21–15 |
| Jul 3, 2026 | HB 5630: Appropriations: school aid omnibus; fiscal year 2026-2027 appropriations for K-12 school… | Yes | Yes | No | Passed 25–11 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time Bayer 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 |
|---|---|---|---|
| 2022 | Michigan State Senate, District 13 | Won | D+14.3 |
| 2018 | Michigan State Senate, District 12 | Won | D+0.8 |
Source: 99chambers results archive
Seats Bayer has held
- Michigan State Senate, District 13 · since 2022
- Michigan State Senate, District 12 · since 2018
Source: 99chambers results archive
Who Bayer has run against
- Jason Rhines (R) · 2022 general, won
- Michael D. McCready (R) · 2018 general, won
Source: 99chambers results archive
How we know Bayer
One person, matched across every source we use.
- Open States ocd-person/3e24c95f-2ed8-442a-a41f-1a3a9a0b95ed
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET