Official primary election ballot
Source:
Section 254.115 — Official primary election ballot, https://www.oregonlegislature.gov/bills_laws/ors/ors254.html
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See also annotations under ORS 249.354 in permanent edition.
Attorney General Opinions
Write-in vote for candidate who is a registered member of a different party than that of voter, (1978) Vol 38, p 2166