Another sad sign today of the toll that public life can take on families: Former vice president Al Gore and wife Tipper have announced they are separating.Public life? Really? They've been married for forty years. Their marriage withstood 16 years of his congressional service and eight years in the vice presidential mansion, plus a tragic presidential race. He's been in private life for a decade now. We don't know what split them apart, but it probably wasn't "public life."