CalledUnofficial results
Montana Senate District 1
Montana State Senate · Montana
Steve Gunderson held the seat for Republicans, winning by 51.3 points over Jonathan Russell Jameson.
Staggered Senate
Steve GundersonRepublican · winner
75.6%8,226
Jonathan Russell JamesonDemocrat
24.4%2,648
10,874 votes
Source: Montana Secretary of State unofficial resultsUpdated Nov 7, 2026, 1:22 PM ET
Where the race moved
Against the 2024 presidential vote
The seat's recent races
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)
Money in this race
Each line compares the two campaigns on one scale.
Jonathan Russell JamesonSteve Gunderson
$2.6K
Raised by the campaign
$16.3K
$1.9K
Spent by the campaign
$12K
Campaign money: Montana Commissioner of Political Practices, through Sep 10, 2026; Montana Commissioner of Political Practices, through Sep 29, 2026.
Source: Montana Commissioner of Political Practices campaign filingsUpdated Sep 10, 2026
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Jonathan Russell Jameson
- <1%
- Steve Gunderson
- >99%
- Projected margin
- R+45.1