Kennedy clan black sheep William Kennedy Smith is again facing accusations that he raped a woman. The nephew of Massachusetts Sen. Edward Kennedy and the late President John F. Kennedy was sued yesterday in Chicago by his former personal assistant, who charged that Smith, 43, sexually assaulted her in his home five years ago. The suit, filed 13 years after Smith beat a highly publicized rape case in Florida, comes from Audra Soulias, who says Smith attacked her at his North Side digs in 1999 after plying her and friends with booze to celebrate her 23rd birthday. "He dragged me...