Nearly 92% of Pittsburgh educators voted Monday to authorize their union to call a strike. Pittsburgh Public Schools hasn't had a teacher strike in 31 years. "The executive board has been clear that our objective is to reach a resolution of our disagreements without any disruption," said Pittsburgh Federation of Teachers president John Tarka. "Nevertheless, this type of support by an organization is very important." The district's two-year contract expired June 30, and negotiators have yet to resolve issues on salary, medical insurance and some issues related to the work day.