2026 General Election · Tuesday, November 3, 2026

Missouri House District 105

2 candidates, listed alphabetically.

Candidates

Cat Clayton

Democratic

Work
Software and data engineer

Cat Clayton is a software and data engineer and community advocate.

Sources for Clayton

Colin Wellenkamp

RepublicanIncumbent

In office now
State Representative, District 105 (since 2024)
Work
State Representative, Missouri House District 105 (since 2025); Executive Director, Mississippi River Cities & Towns Initiative; adjunct professor

Colin Wellenkamp has served as State Representative for District 105 in the Missouri General Assembly since 2024, a district that includes all or part of St. Charles County.

Colin Wellenkamp is executive director of the Mississippi River Cities & Towns Initiative, an association of 105 river cities, and an adjunct professor at Saint Louis University and Washington University. He has worked as an environmental scientist and holds environmental law degrees.

Wellenkamp's committees

  • Conservation and Natural Resources
  • Joint Committee on the Life Sciences
  • Local Government
  • Special Committee on Intergovernmental Affairs

Sources for Wellenkamp

Sources

Candidate list and race details

What's included
U.S. Senate and House, statewide offices, every state legislative district on the ballot and statewide ballot measures.
Everything else
Local races (county, city, school board, judges) and anything else on your ballot are on your official sample ballot: voteroutreach.sos.mo.gov.
Candidate lists
As of Wednesday, October 14, 2026.

This is not an official ballot. Confirm your registration, polling place and ballot with your election office through vote.gov.