1990Final results
1990 election for Oregon Senate District 20
Oregon State Senate · Oregon
Grattan Kerans (D) won with 63.2% of the vote, defeating Peter Swan (R) by 26.5 points.
Grattan KeransDemocrat · winner · incumbent
63.2%22,697
Peter SwanRepublican
36.8%13,198
35,895 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