The role Justice Souter played in court

Justice David Souter is planning to retire after more than 19 years on the Supreme Court, giving President Obama his first chance to fill a vacancy. What was Souter known for, and what will his retirement mean for the Supreme Court? To answer these questions on The Takeaway is Nate Persily, a professor of law and political science at Columbia University. He was at the Supreme Court this week watching the events unfurl.