Oregon Revised Statutes Elections § 260.567

(a) Alter, correct, clarify or obscure on the signature sheet any information about the person who signed the signature sheet if the line on which the signature appears is subsequently initialed by the person who signed the signature sheet; or

(b) Write, alter, correct, clarify or obscure on the signature sheet any information about the person who signed the signature sheet if the person who signed the signature sheet is a person with a disability and requests assistance in writing, altering, correcting, clarifying or obscuring on the signature sheet any information about the person.

(a) “Information about the person who signed the signature sheet” means any information regarding the person who signed the signature sheet of an initiative, referendum, recall or candidate nominating petition, a prospective petition for a state measure to be initiated or a certificate of nomination, in addition to the signature of the person, that is required or requested to be supplied on a signature sheet of an initiative, referendum, recall or candidate nominating petition, a prospective petition or a certificate of nomination.

(b) “The person who signed the signature sheet” means the person whose signature will be submitted for verification under ORS chapter 249 or ORS 250.045 (3), 250.105, 250.215, 250.315 or 255.175 for the purpose of determining whether the petition, prospective petition or certificate contains the required number of signatures of electors.