Hunter Biden used his family’s high-profile connections to promote friends and associates to federal office while his father was vice president, emails obtained from his hard drive show. During the spring of 2010, Hunter Biden exchanged a series of emails with John M. Mott, an associate judge of the Superior Court of the District of Columbia who was angling for appointment to the federal bench. “I appreciate your help,” Mott told Hunter Biden in a March 9, 2010 email after the two spoke by phone. Mott asked Hunter to press his case to then Vice President Biden’s chief of staff...