Leaving office January 1, 2027.Lost re-election in 2026. This page switches to the former-officeholder layout when the term ends.

RepublicanIn office until January 1, 2027

Colin Wellenkamp

Missouri State Representative, District 105 since 2024. Lost re-election in 2026; leaves office in January 2027.

Missouri State Representative, District 105

Official website

In office: 1 yr; Since 2024
Bills became law: 0; 19 sponsored, 2025–2026 session
Last margin: −11.1; Lost 2026

Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET

Committees

As of 2026-10.

Conservation and Natural Resources
Intergovernmental Affairs Special
Life Sciences
Local Government

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

Legislation

2025–2026 session · 19 sponsored · 0 became law

BillIntroCmteHouseSenateLaw

HB 1736 Modifies provisions governing county sales taxes for park purposes to allow tax revenues to be used for…
COUNTIES · Failed in the Senate May 2026

HB 2142 Modifies the "Show MO Act" tax credit caps for qualified motion media production projects
BUSINESS AND COMMERCE · Failed in the Senate Apr 2026

HB 3193 Phases out the use of single-use plastic products at Missouri State Parks and Historic Sites
ENVIRONMENTAL PROTECTION · Failed in the House Apr 2026

HB 1734 Creates a revolving loan program to assist homeowners' associations with erosion control
CORPORATIONS · Failed in the House Apr 2026

HB 3071 Modifies provisions relating to a premises contaminated with radioactive material or other hazardous material
LANDLORDS AND TENANTS · Failed in committee May 2026

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

Career

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

20242025202620272028Missouri House of Representatives, District 105

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	Missouri House District 105	Lost	D+11.1	D+1.1	−10.0
2024	Missouri House of Representatives, District 105	Won	R+5.8	—	—

Source: 99chambers results archive; 2026: civicAPI (unofficial)Updated Nov 8, 2026, 7:01 PM ET

Seats Wellenkamp has held

Missouri House of Representatives, District 105 · since 2024

Source: 99chambers results archive

Who Wellenkamp has run against

Cat Clayton (D) · 2026 general, lost
Ron Odenthal (D) · 2024 election, won

Source: 99chambers results archive; 2026: civicAPI (unofficial)

How we know Wellenkamp

One person, matched across every source we use.

Open States ocd-person/0c02ea62-5611-4292-bf13-316c50c3a866

Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET