Brian Lehrer Weekend: Senator Elizabeth Warren, Author Arundhati Roy, Amtrak's CEO on 'The Summer of Hell'

Summary: <p>In case you missed them, hear three of our favorite segments from the week:</p> <p>Senator Elizabeth Warren (First) | Author Arundhati Roy (Starts 20:32) | Amtrak's CEO on 'Summer of Hell' (Starts 48:30)</p>