Few world leaders have had the steely reserve of Winston Churchill. Impervious to the consensus of the day, the iconic British Prime Minister is known for standing firmly on his beliefs when nearly everyone else doubted him. But how did young Winston become the Churchill the world came to know? What gave him the strength to take on the superior force of Nazi Germany when bombs rained on London and so many others had caved? In this installment of “Leonard Lopate at Large,” Andrew Roberts, author of the comprehensive biography “Churchill: Walking with Destiny” explains what drove this towering figure figure of global politics in the 20th century.