A union representing professors, librarians and coaches at Sonoma State and 22 other California State University campuses has voted overwhelmingly to approve a strike, which could occur over several weeks beginning in April.Because of the size of the CSU system, Travis said, "if we strike, it will be the largest strike in the history of higher education in this country."New CSU tenure-track faculty start at about $50,000 a year, the average salary for tenure-track is $71,000, and the average for faculty with 20 years of experience is $86,000.Instructors, who teach 60 percent of CSU classes, earn an average of $58,000...