Oregon Revised Statutes Elections § 254.445

(1) If an elector is within the county and, because of a physical disability or an inability to read or write, is unable to mark the ballot, the elector may request and shall receive the assistance of two persons of different parties provided by the clerk or of some other person chosen by the elector in marking the ballot. The persons assisting the elector shall ascertain the wishes of the elector and assist the elector in voting the ballot accordingly, and thereafter may give no information regarding the vote.

(2) A person may not assist an elector under subsection (1) of this section if the person:

(3) In preparing the ballot, an elector may use or copy a sample ballot, which may be marked in advance to assist the elector in marking the official ballot.