Edward "Ted" Kaufman, a former aide to Sen. Joe Biden, was named Monday by Delaware Gov. Ruth Ann Minner to fill the Senate seat Biden is leaving for the vice presidency. Kaufman is president of a political and management consulting firm based in Wilmington. Speculation on Biden's successor had centered in recent weeks on his son, Attorney General Beau Biden. Last week, however, the younger Biden announced that he planned to fulfill his National Guard duties and wouldn't accept an appointment to his father's US Senate seat.