Reno, Nev. -- Jimmy Carter's son, Jack Carter, won the Democratic nomination Tuesday to face Republican U.S. Sen. John Ensign in November in Nevada, where voters also were picking candidates in a wide-open and sometimes-zany pair of primaries to replace popular Republican Gov. Kenny Guinn. Carter claimed 80 percent of the vote in early returns to defeat political unknown Ruby Jee Tun of Carson City, a middle school science teacher. Ensign won with more than 90 percent of the vote over Ed "Fast Eddie" Hamilton of Las Vegas, a former Chrysler Corp. supervisor. Tessa Hafen, former press secretary for Nevada's...