The 66th Oregon Legislative Assembly was the legislative session of the Oregon Legislative Assembly that convened on January 14, 1991, and adjourned June 30, 1991. It was held at the Oregon State Capitol in Salem. Democratic members held majorities over the Republican members in both the Senate (20–10) and the House of Representatives (27–33). It was the first time since the 61st Assembly, as well as the most recent legislature as of , in which either party held a two-thirds supermajority in the State Senate.
Senate Affiliation Members Democratic20 Republican10 Total30 Government Majority10
Jane Cease resigned July 31, 1991 to accept appointment as Administrator of Motor Vehicle Division; Ron Cease was appointed by Multnomah County Commissioners to fill the vacancy on August 22, 1991. Mike Thorne resigned January 17, 1991 to accept his appointment as Director of the Port of Portland; Scott Duff was appointed on February 17, 1991, to fill the vacancy. Larry Hill resigned November 1, 1991, to become a lobbyist; Bill Dwyer was appointed by Lane County Commissioners to the seat on November 26, 1991.
Senate Members + Composition of the Senate District SenatorParty1 Joan DukesDemocratic2John BrennemanRepublican3Robert C. ShoemakerDemocratic4Paul PhillipsRepublican5Jeannette HambyRepublican6Richard Samuel SpringerDemocratic7Shirley GoldDemocratic8Bill McCoyDemocratic9Frank L. RobertsDemocratic10Jane Cease, Ron CeaseDemocratic11Glenn Edward OttoDemocratic12Bill KennemerRepublican13Joyce CohenDemocratic14Bob KintighRepublican15Jim BunnRepublican16Jim A. HillDemocratic17Tricia SmithDemocratic18Clifford W. TrowDemocratic19Mae YihDemocratic20Grattan KeransDemocratic21Bill Dwyer, Larry HillDemocratic22Peggy JolinDemocratic23John KitzhaberDemocratic24Bill Bradbury (Majority Leader)Democratic25Ronald D. GrenskyRepublican26Lenn HannonRepublican27Peter Marik BrockmanRepublican28Wayne H. FawbushDemocratic29Scott Duff, Mike ThorneDemocratic30Gene TimmsRepublican
House Affiliation Members Democratic27 Republican33 Total60 Government Majority5
Judy Bauman resigned on November 1, 1991, to accept appointment as Administrator of the Community Services Division. Kate Brown was appointed on November 26, 1991, to fill the vacancy. Tom Brian changed parties, from a Democrat to Republican on September 5, 1991. Ronald Cease resigned from House and was appointed to the Senate on August 22, 1991. Avel Gordly was appointed on September 30, 1991, to fill the vacancy. William Dwyer resigned from the House and was appointed to Senate on December 4, 1991. Lee Beyer was appointed December 30, 1991 to fill the vacancy. Bob Pickard changed parties from Republican to Democrat on September 12, 1991. Gail Shibley was appointed on January 16, 1991, to fill the vacancy of Phil Keisling who resigned from the sixty-fifth legislative assembly on January 14, 1991.
House Members + Composition of the House District House MemberParty1 Bruce HugoDemocratic2Jacqueline S. TaylorDemocratic3Timothy E. JosiDemocratic4Hedy RijkenDemocratic5John E. MeekRepublican6Delna JonesRepublican7Ted CalouriRepublican8Mary Alice FordRepublican9Tom BrianChanged from Democrat to Republican Midterm on September 510Vera KatzDemocratic11Thomas L. MasonDemocratic12Gail Shibley, Phil KeislingDemocratic13Judith Bauman, Kate BrownDemocratic14Beverly SteinDemocratic15Lisa H. NaitoDemocratic16Tom NovickDemocratic17Mike BurtonDemocratic18Margaret CarterDemocratic19Ronald Cease, Avel GordlyDemocratic20John MinnisRepublican21Lonnie J. RobertsDemocratic22Ron P. SunseriRepublican23Robert R. ShiprackDemocratic24Randy MillerRepublican25Dave McTeagueDemocratic26Larry SowaDemocratic27Kelly Clark Jr.Republican28Fred ParkinsonRepublican29Stan BunnRepublican30Jeff GilmourDemocratic31Gene DerflerRepublican32Kevin MannixDemocratic33Peter Courtney (Minority Leader)Democratic34John SchoonRepublican35Tony Van VlietRepublican36Carolyn L. OakleyRepublican37Liz VanLeeuwenRepublican38Cedric Ross HaydenRepublican39Jim EdmunsonDemocratic40Carl HostickaDemocratic41Marie D. BellRepublican42William J. Dwyer, Lee BeyerDemocratic43Larry Campbell (Speaker)Republican44Sam DominyDemocratic45Ron JohnsonRepublican46Bill MarkhamRepublican47Jim WhittyDemocratic48Walter G. SchroederRepublican49Bob RepineRepublican50John W. WattRepublican51Eldon JohnsonRepublican52Jerry BarnesRepublican53Del ParksRepublican54Bob PickardChanged parties from Republican to Democrat on September 1255Bev ClarnoRepublican56Greg Walden (Majority Leader)Republican57Charles R. NorrisRepublican58Raymond BaumRepublican59Michael R. NelsonDemocratic60Denny JonesRepublican
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