It is not merely the ranting of radio talk show hosts and their callers. It is not just daydreaming by political junkies. It's still a long shot, but it really could happen. Hillary in '04! No, Sen. Hillary Rodham Clinton of New York is not about to announce her candidacy for president in 2004, joining the jostling pack of Democratic candidates elbowing each other and participating in their first debate this weekend in South Carolina. Her reputation for keeping secrets is well-known, but everybody believes she is planning to sit out 2004 and aiming for the 2008 election to run...