2000Flipped from RepublicanFinal results
2000 election for Arizona Legislative District 12
Arizona State Senate · Arizona
Mark Osterloh (D) won with 56.3% of the vote, defeating Toni Hellon (R) by 12.6 points, a seat Republicans won last time.
Mark OsterlohDemocrat · winner
56.3%34,707
Toni HellonRepublican
43.7%26,950
61,657 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 2000
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET