If the left is going to take control of the Democratic Party, the Pacific Northwest, with its oversupply of culturally progressive, college-educated white people, is where it would happen first. It is therefore notable that voters in Oregon struck a devastating blow against the left in three elections Tuesday. In one primary, mainstream Democrat Janelle Bynum defeated progressive favorite Jamie McLeod-Skinner to face off in a winnable purple district. In another, Representative Maxine Dexter prevailed over Susheela Jayapal in a primary in a heavily Democratic district. And most revealingly, Nathan Vasquez unseated progressive prosecutor Mike Schmidt in Portland, one of...