Candidate briefing
Bethany Mann is the 2026 Democratic nominee for Missouri’s 3rd Congressional District. She won the August 4 primary with 69.1 percent of the vote over Tommy Holstein and Paul Wilson, and faces Republican Rep. Bob Onder in November.
Her campaign identifies her as an environmental chemist and technology specialist from St. Peters who grew up in Foristell and works in energy and water infrastructure, including testing for contaminants such as lead and PFAS. Wikipedia records her as the Democratic nominee in this district in 2022 and 2024. Mid-Missouri DSA has endorsed her this cycle.
Why Political Revolution supports her: she is the progressive nominee in a contested Missouri House race, backed by Mid-Missouri DSA after winning a three-way primary.