When the Californicators migrated north to Oregon and Washington.
Oregon really went left in the sixties. The U. of Oregon and Portland State allowed radicals to run wild. U. of Oregon buildings were bombed on more than one occasion. Marxist organizers showed up from the Midwest and from New York City. Professors were threatened, sit-ins and teach-ins were common. Then, when flower power became the target of thugs in San Francisco many hippies headed north to Oregon. Their number increased when tolerance of narcotics became endemic. In reality, with the growing influx of radicals it was no great trick to take control of Portland, which took about ten years to effect politically.