CalledUnofficial results
Iowa Senate District 37
Iowa State Senate · Iowa
Molly Donahue won re-election by 24.8 points over Randy Marzen.
Staggered Senate
Molly DonahueDemocrat · winner · incumbent
62.4%18,833
Randy MarzenRepublican
37.6%11,350
Write-inOther party
0.1%18
30,201 votes
Source: Iowa Secretary of State unofficial resultsUpdated Nov 7, 2026, 1:35 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.
Molly DonahueRandy Marzen
$16.4K
Raised by the campaign
$9.4K
$5K
Spent by the campaign
$3.2K
Campaign money: Iowa Ethics and Campaign Disclosure Board, through May 14, 2026; Iowa Ethics and Campaign Disclosure Board, through Jul 8, 2026.
Source: Iowa Ethics and Campaign Disclosure Board campaign filingsUpdated Jul 8, 2026
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Molly Donahue
- >99%
- Randy Marzen
- <1%
- Projected margin
- D+22.9
The candidates
Molly Donahue (D)
Incumbent, Iowa State Senate, first elected 2022Randy Marzen (R)
Incumbent, Iowa State Senate, first elected 2022Randy Marzen (R)
Also on the ballot: Write-in (Other party), 0.1%