When 61-year-old Mary S. Trew was a law student in the 1970s, she couldn’t even name a judge she suspected might be gay, much less an actual openly gay judge.Now, she’s taken over an organization that coordinates lesbian and gay judges to talk with law students and to march in Chicago Pride parades.Trew, a Cook County associate judge, became president of the Alliance of Illinois Judges at the group’s annual meeting on June 21. Founded in 2009, the Alliance has about 35 members including gay jurists and …