ORS 247.203: Change, termination or adoption of party affiliation before primary election.

An elector who updates a registration during the period extending from the 20th day before a primary election to the date of the primary election may not, during that period:

      (1) Change the elector’s political party affiliation if the elector’s immediate past registration record shows the elector was or is registered as affiliated with a political party.

      (2) Terminate affiliation with a political party if the elector’s immediate past registration record shows the elector was or is registered as affiliated with a political party.

      (3) Adopt a political party affiliation if the elector’s immediate past registration shows that the elector was not or is not registered as affiliated with a political party.