 Programming on Minnesota Public Radio is supported by Luther College, where academic scholarships are automatically offered to eligible students upon admission. And the Minnesota Impact Award covers 100% of tuition for qualifying students. More at luther.edu. This week on the New Yorker Radio Hour, how Robert Caro came to write The Power Broker, a masterpiece published 50 years ago in the New Yorker. Robert Caro joins me next time on the New Yorker Radio Hour.