In the abstract, I agree that this topic should be "out of bounds". As applied to this particular player, I'm constrained to ask the question:
Aren't they "fair game?"
Of course, whether the children are the progeny of Sen. Edwards or some other donor, the question posed in the title of the thread is legitimate.
What does Kerry, the self-styled "Catholic" candidate for Pres., who describes himself as being against abortion personally, but unwilling to impose his personal beliefs on that question upon society, think abour "selective abortion", or "reduction", or whatever other euphemism the death merchants have coined for the process under which his running mate's children were engendered?
Do you suppose John Edwards might have "channeled" with the male zygotes vying for the privilege of impregnating Mrs. Edwards and ascertained which among them were worthy of the privilege?