Mary Jane Burke secured her seventh four-year term as Marin County Superintendent of Schools this week, with 78 percent of the vote. She faced heated opposition from West Marin School Principal Matt Nagle, whose platform to focus on underachieving Mexican-American students brought him 22 percent support. “I believe this election shows that our community will support a leader willing to make the tough decisions and to do the right thing, even if it costs some…