Flipped from RepublicanCalledUnofficial resultsIncumbent defeated
Wisconsin Senate District 17
Wisconsin State Senate · Wisconsin
Jenna Jacobson flipped the seat for Democrats, winning by 7.6 points over Howard Marklein.
Staggered Senate
Jenna JacobsonDemocrat · winner
53.8%43,775
Howard MarkleinRepublican · incumbent
46.2%37,593
11% of the expected vote counted · 81,368 votes
Source: civicAPI unofficial results and race callsUpdated Nov 5, 2026, 2:54 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.
Jenna JacobsonHoward Marklein
$2.2M
Raised by the campaign
$2.9M
$1.9M
Spent by the campaign
$2.3M
$42.1K
Cash on hand
$55.2K
Campaign money: Wisconsin Ethics Commission, through Oct 28, 2026.
Source: Wisconsin Ethics Commission campaign filingsUpdated Oct 28, 2026
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Jenna Jacobson
- 81%
- Howard Marklein
- 19%
- Projected margin
- D+6.2