Missouri › St Charles County › Missouri House District 105
2 candidates are tracked for Missouri House District 105 on the November 3, 2026 ballot: Colin Wellenkamp and Cat Clayton. Candidate information follows official St Charles County election filings; verify with the official election office linked below.
Colin Wellenkamp (Republican), Cat Clayton (Democratic) meet on the November 3 ballot; Colin Wellenkamp is the sitting member per the House roster. Missouri has no runoffs; the August 4 primary winner of each party is the nominee, and unopposed nominees still print. The field is the Missouri Secretary of State's certified general election candidate list (certified August 25, 2026). This seat is elected by district; only the district covering your address appears on your ballot.
Republican · Incumbent
Colin Wellenkamp is the Republican nominee for Missouri House District 105 on the November 3, 2026 ballot, per the Missouri Secretary of State's certified general election candidate list.
Source: candidate campaign site, roster verified 2026-09-06.
Campaign site →Democratic
Cat Clayton is a software and data engineer and community advocate, per her candidate profile with the recruitment group Leaders We Deserve. Her father and husband have both served in the military. No campaign website or questionnaire response was found as of September 6, 2026.