The former mayor of New Orleans, Marc Morial, discusses his new book "The Gumbo Coalition: 10 Leadership Lessons That Help You Inspire, Unite, and Achieve." Morial, now president of the National Urban League, tells "CBS This Morning" national correspondent Jericka Duncan how certain moments in his life shaped his outlook on leadership. He also explains what leaders can provide in times of crisis, like the current coronavirus pandemic. And he comments on the murder of Ahmaud Arbery.