The ACLU in Massachusetts is in the midst of a eye-opening campaign to raise the profile district attorney races. “What a difference a DA makes,” says the ACLU — and I’m convinced. They have an enormously wide amount of prosecutorial discretion that sets the tone for social justice in a county. Today, I went to a meet and greet with a DA candidate, Donna Patalano, in Middlesex County. And she made strong points not only about prosecutorial discretion, but also about transparency in the criminal justice system.