Another major teachers’ union is set to bring a wave of misery to California — a week after strikes in San Francisco brought the city to a halt . Oakland Unified School District is set to hit the picket line as soon as next week after overwhelmingly voting in favor of a walkout at the end of last week. The education association said 91% of participating members backed the move, accusing the district of failing to make meaningful movement on salary demands and classroom conditions. It comes just