Ben Bradlee, the legendary Washington Post editor who died recently, has been widely praised for his work building up The Washington Post and bringing down Richard Nixon. His guidance of the paper's Watergate coverage thrilled a generation, maybe two generations, of aspiring journalists.But the many extravagant tributes to Bradlee have paid less attention to his relationship with an earlier president, John F. Kennedy. It's not that their friendship was a secret; Bradlee wrote a book about it.