Union leaders for 1,900 striking teachers in Tacoma, Washington, reached a tentative contract deal on Wednesday night with school district officials in talks mediated by the state’s governor, ending the walkout after more than a week, Reuters reports. The settlement, which the teachers must still ratify, was announced by Governor Christine Gregoire shortly before 10:30 p.m. local time from her office in the state capital, Olympia, where she had summoned the parties for a last-ditch round of bargaining about seven hours earlier…