Sen. Elizabeth Warren on ending the school-to-prison pipeline and ‘what matters’ most to 2020 voters

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Tonight in our series “What Matters,” Sen. Elizabeth Warren addresses a top concern among some Democratic voters as they make their decision about who to support in the 2020 primaries — the so-called “school to prison” pipeline that critics say funnels far too many of our nation’s students from the classroom into the criminal justice system.