Oregon Revised Statutes Elections § 249.180

Any person who has been nominated at a primary election, or any person who has been nominated to fill a vacancy as provided in ORS 188.120 or 249.190 and 249.200, may withdraw from nomination by filing a written statement declining the nomination and stating the reason for withdrawal. The statement shall be signed by the candidate and filed not later than the 67th day before the general election with the officer with whom the candidate's declaration of candidacy or nominating petition was filed.