Flipped from RepublicanCalledUnofficial results
Arizona Legislative District 13
Arizona State Senate · Arizona
Kristie O'Brien flipped the seat for Democrats, winning by 9.9 points over Julie Willoughby.
Kristie O'BrienDemocrat · winner
54.9%50,289
Julie WilloughbyRepublican
45.0%41,194
Unofficial Write-inOther party
0.1%59
91,542 votes
Source: Arizona Secretary of State unofficial resultsUpdated Nov 7, 2026, 12:53 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.
Kristie O'BrienJulie Willoughby
$263K
Raised by the campaign
$424.2K
$179.1K
Spent by the campaign
$320.1K
$73.3K
Cash on hand
$104.1K
Campaign money: Arizona Secretary of State, through Sep 30, 2026.
Source: Arizona Secretary of State campaign filingsUpdated Sep 30, 2026
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Kristie O'Brien
- 64%
- Julie Willoughby
- 36%
- Projected margin
- D+2.6