Well - assuming that fabrications are that easy to manufacture and peddle - take a look at someone even more reviled on the left, say Newt Gingrich, and ask why there haven’t been spades of such accusations (gay, straight, etc., etc., etc.) against them.
Craig's situation is in no way comparable to Newt's. What's wrong with due process of law in Craig's case? I think that's mentioned in the Constitution somewhere. Maybe he's gay but if not he deserves the chance to defend himself.