1990Final results
1990 election for Oregon Senate District 13
Oregon State Senate · Oregon
Joyce Cohen (D) won with 52.0% of the vote, defeating Bob Tiernan (R) by 4.0 points.
Joyce CohenDemocrat · winner · incumbent
52.0%22,882
Bob TiernanRepublican
48.0%21,123
44,005 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 1990
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET