JOHN FORBES DUKAKIS It's hard to criticize John Kerry these days. Apparently, every criticism of him is unfair. At least, we're not supposed to criticize his time in Vietnam -- or even what he's said about Vietnam more recently -- because that would be a "smear" (even when the Kerry campaign admits, as it has regarding Kerry's Christmas-in-Cambodia claims, that he hasn't been telling the truth). . As he drew nearer, however, the woman suddenly ripped off her Cahill mask, behind which was ... Susan Estrich, Michael Dukakis' campaign manager! At that point, he woke up screaming. Ouch. The difference,...