RepublicanIn office since Nov 2022

Brian Mulder

South Dakota State Representative, District 11 since 2022. Re-elected in 2026. Next on the ballot in 2028.

South Dakota State Representative, District 11

Official website Wikipedia

In office: 3 yrs; Since 2022
Bills became law: 16; 31 sponsored, 2025–2026 session
Votes missed: 0.3%; Chamber median 0.8%
With party: 73%; On votes splitting the parties
Last margin: −0.3; Won 2026
Next election: 2028; Nov 7, 2028

Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 1:52 PM ET

Committees

As of 2026-10.

Developmental Disability Service Delivery · vice chair
Health and Human Services · chair
Bonding
Executive Board
Transportation

Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET

Legislation

2025–2026 session · 31 sponsored · 16 became law

BillIntroCmteHouseSenateLaw

SB 221 regulate the retail sale of nicotine products, and to provide a penalty therefor.
Administrative Procedure · Became law Mar 2026

HB 1220 regulate the sale of nicotine products, and to provide a penalty therefor.
Administrative Procedure · Became law Mar 2026

HB 1244 repeal the special donations fund and make an appropriation to the Department of Education for the provision…
Appropriation · Became law Mar 2026

HB 1250 revise the types of community-based providers for purposes of state funded services.
Community-Based Providers · Became law Mar 2026

SB 15 create the Developmental Disability Service Delivery Committee.
Developmentally Disabled Persons · Became law Mar 2026

Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET

Voting record

2025–2026 session · placement by roll-call votes

Where Mulder sits in the South Dakota House of Representatives

Mulder is closer to the center than 56% of the chamber's Republicans.

Closest: Scott Moore, Greg Jamison, Trish Ladner

Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 5:01 PM ET

With Mulder’s party

Votes with the chamber's Republicans73%

Black tick: the average of Republicans in the South Dakota House of Representatives.

Source: 99chambers legislative scores from roll calls and cosponsorships

Key votes

Votes chosen for their effect, not their side: Mulder’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.

Date	Bill	Mulder	Rep. majority	Dem. majority	Result
Mar 30, 2026	HB 1138: require the licensure of non-medical home care agencies, and to provide a penalty therefor.	Yes	Yes	Yes	Failed 36–27
Mar 30, 2026	HB 1077: consider a cultivated-protein food product to be adulterated food.	No	Yes	No	Failed 32–32
Mar 9, 2026	SB 245: create the homeowner property tax reduction fund, and to transfer moneys to the homeowner…	No	Yes	No	Passed 42–27
Mar 5, 2026	SB 159: revise requirements pertaining to the minimum age for marriage.	No	Yes	Yes	Passed 40–27
Mar 5, 2026	SB 179: permit a court to commit a juvenile adjudicated delinquent for certain weapons offenses to…	Yes	Yes	No	Passed 42–25

Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls

Career

Offices held, and every time Mulder was on a ballot. Filled marks are general elections won; hollow marks are primaries; an orange outline is a loss.

2022202320242025202620272028South Dakota House of Representatives, District 11

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	South Dakota Legislative District 11	Won	D+0.3	R+9.6	−9.9
2024	South Dakota House of Representatives, District 11	Won	R+1.5	—	—
2022	South Dakota House of Representatives, District 11	Won	R+0.6	—	—