Democratic Party presidential frontrunner Hillary Clinton warned on Friday that President Bush's decision not to negotiate with North Korea over that country's nuclear weapons program is a mistake. "I know the administration has taken the position that they will not, under any circumstances, negotiate," Clinton told ABC Radio Network News. "You know, I believe that you can be very tough, you can enforce America's interests and values while still talking." Mrs. Clinton did not comment on the disparity between her own advice to keep negotiating and her husband's recent revelation that he threatened to bomb North Korea in 1994 in...