Joe Biden and Jim Kennedy stood out on what used to be Maloney Field in Green Ridge as a huge earthmover, with tires 5 feet tall, crawled along. “Run under that, Joe,’” Jim Kennedy dared. Joe Biden, 8 or 9 years old, scurried between the front and back tires, letting the front axle pass over him as the mover backed up. He survived, unscarred. “Jesus, what the hell did you do that for?” Jim Kennedy wailed. If Joe Biden said anything, all Magisterial District Judge James Kennedy remembers decades later is the boy’s laughter and wanting to smush the youngster...