What made Teresa Heinz Kerry so refreshing to some voters, and threatening to others on the 2004 campaign trail, is summed up when THK talks about her speech to last year's Democratic convention:"Nobody told me what to do," she told a Saturday fund-raiser here.The implicit afterword: Nobody better try. The sails of the philanthropist wife of Sen. John Kerry were not trimmed by November's narrow electoral defeat. The softly accented voice gives pointed advice to the Democratic Party, which she lately joined, formerly having spent 15 years as wife of a Senate Republican.Heinz Kerry flew into town on her own...