1986Final results
1986 election for Oklahoma Senate District 20
Oklahoma State Senate · Oklahoma
Olin Branstetter (R) won with 56.5% of the vote, defeating Dennis A. Coates (D) by 13.0 points.
Olin BranstetterRepublican · winner
56.5%12,980
Dennis A. CoatesDemocrat
43.5%9,987
22,967 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 1986
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET