Benjamin Crump, the lawyer who skyrocketed to national prominence by representing the family of Trayvon Martin, the unarmed Florida teenager who was followed, confronted and shot to death by George Zimmerman in Sanford, Fla., said that since the 4th grade, he always knew that he wanted to grow up and fight for the community. “The measure of a man is defined by the impact that they make on the world,” said Crump. “Everyday we have to get up and ask, ‘What impact are we going to make on the world?’ and we have to do it, because our children are...