WHEN he ran for president, Bill Clinton's campaign stressed the advantage his wife's experience and feminist credentials would bring to the job of First Lady. But now that Hillary Clinton is preparing a presidential campaign, his time in the Oval Office is as much a handicap as an advantage. Yesterday the New York Times devoted a 2,000-word story on its front page to the state of the Clintons' marriage. Noting, without comment, that the couple have been together for just 14 nights a month in the last two years, the paper speculated on whether or not the baggage from Mr...