For all of his success as a prosecutor, state legislator and congressman, it might have been his experience with a Black kid from Inglewood that has shaped Schiff most. In his mid-20s, fresh out of law school, he volunteered to become a “big brother” through Big Brothers Big Sisters of Greater Los Angeles. He was paired with David McMillan, a child of a single mother who needed a male role model for her son. The two hit it off immediately, bonding over “The Big Lebowski,” Billy Joel and the beach. Three decades later, they are still part of each other’s...