RepublicanIn office since Nov 2020

Marty Overweg

South Dakota State Representative, District 21 since 2020. Ran in 3 elections between 2020 and 2024, winning 3. Re-elected in 2026. Next on the ballot in 2028.

South Dakota State Representative, District 21

Official website Wikipedia

In office: 6 yrs; Since 2020
Bills became law: 27; 46 sponsored, 2025–2026 session
Votes missed: 0.0%; Chamber median 0.8%
With party: 88%; On votes splitting the parties
Last margin: −5.5; 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.

Agriculture and Natural Resources · chair
Government Operations and Audit · chair
Government Operations and Audit · chair
State Affairs · vice chair
Legislative Procedure
Legislative Procedure

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

Legislation

2025–2026 session · 46 sponsored · 27 became law

BillIntroCmteHouseSenateLaw

HB 1215 authorize counties and municipalities to issue a license for a cigar bar.
Administrative Procedure · Became law Mar 2026

SB 106 modify the amount required to be set aside for extraordinary expenses incurred in providing special…
Education · Became law Mar 2026

HB 1264 eliminate the Agricultural Land Assessment Implementation and Oversight Advisory Task Force, and to provide…
Administrative Procedure · Became law Mar 2026

SB 3 limit the types of residential improvements for which counties, municipalities, and townships may require a…
Construction Standards · Became law Mar 2026

SB 88 clarify the procedure for a potential condemnor to examine real property absent the property owner's…
Eminent Domain · 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 Overweg sits in the South Dakota House of Representatives

Overweg is closer to the center than 36% of the chamber's Republicans.

Closest: Kaley Nolz, Scott Odenbach, Liz May

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

With Overweg’s party

Votes with the chamber's Republicans88%

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: Overweg’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.

Date	Bill	Overweg	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.	No	Yes	Yes	Failed 36–27
Mar 30, 2026	HB 1077: consider a cultivated-protein food product to be adulterated food.	Yes	Yes	No	Failed 32–32
Mar 9, 2026	SB 245: create the homeowner property tax reduction fund, and to transfer moneys to the homeowner…	Yes	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…	No	Yes	No	Passed 42–25

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

Career

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

202020212022202320242025202620272028South Dakota House of Representatives, District 19 South Dakota House of Representatives, District 21

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 House of Representatives, District 21	Won	D+5.5	R+54.9	−60.4
2024	South Dakota House of Representatives, District 21	Won	R+3.7	R+54.9	−51.2
2022	South Dakota House of Representatives, District 21	Won	R+5.6	R+51.0	−45.4
2020	South Dakota House of Representatives, District 19	Won	D+12.9	—	—