Kathleen Williams
Last held office: Montana House of Representatives, District 61 (2014–2016). Won the 2026 race for Montana Senate District 31.
Last office: Montana House of Representatives, District 61Born 1961
- Last margin
- +38.8
- Won 2026
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 1:52 PM ET
Career
Offices held, and every time Williams was on a ballot. Filled marks are general elections won; hollow marks are primaries; an orange outline is a loss.
Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Every race Williams has run
Baseline: how the seat voted for president in the same or nearest year. Running ahead of it means Williams won voters the party’s presidential nominee did not; primaries have no baseline.
| Year | Office | Stage | Result | Opponents | Share | Margin | Raised | Baseline | Against baseline |
|---|---|---|---|---|---|---|---|---|---|
| 2026 | Montana Senate District 31 | General | Won | Richard Aungier (R) | 69.4% | D+38.8 | $36.9K | D+18.6 | |
| 2020 | U.S. House, MT-AL | General | Lost | Matthew M. Rosendale, Sr. (R) | 43.6% | R+12.8 | $6.3M | — | |
| 2018 | U.S. House, MT-AL | General | Lost | Greg Gianforte (R), Elinor Swanson (L) | 46.2% | R+4.6 | $4.2M | — | |
| 2014 | Montana House of Representatives, District 61 | General | Won | Nick Mahan (R) | 57.6% | D+15.3 | — | — | |
| 2014 | Montana House of Representatives, District 61 | Primary | Won | Unopposed | 100% | — | — | — | |
| 2012 | Montana House of Representatives, District 65 | General | Won | Nick Mahan (R) | 69.9% | D+39.8 | — | — | |
| 2010 | Montana House of Representatives, District 65 | General | Won | Nick Mahan (R) | 65.9% | D+31.9 | — | — |
Source: 99chambers results archive; 2026: Montana Secretary of State (unofficial)Updated Nov 8, 2026, 7:01 PM ET
Campaign money, 2025–26
- Raised
- $36.9K
- Spent
- $25.9K
Source: Montana Commissioner of Political Practices filings through Oct 13, 2026Updated Nov 1, 2026, 9:16 AM ET
Campaign committees
Open committees can still raise and spend money.
| Williams, Kathleen A State | Active |
Source: Montana Commissioner of Political Practices filings through Oct 13, 2026Updated Nov 1, 2026, 9:16 AM ET
Seats Williams has held
- Montana House of Representatives, District 61 · 2014–2016
- Montana House of Representatives, District 65 · 2010–2014
Source: 99chambers results archive
Who Williams has run against
- Richard Aungier (R) · 2026 general, won
- Matthew M. Rosendale, Sr. (R) · 2020 election, lost
- Greg Gianforte (R) · 2018 election, lost
- Nick Mahan (R) · 2014 election, won
Source: 99chambers results archive; 2026: Montana Secretary of State (unofficial)
How we know Williams
One person, matched across every source we use.
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 1:52 PM ET