[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2011/images/08/30/costello_vert.jpg width=200 height=230 align="right"] From CNN's Carol Costello: You've heard the ever-shifting story by now, it started with a story in Politico. Two women accused Cain of "sexually impropriety" in the 90's, back when Cain was Chief Honcho for the National Restaurant Association. At first Cain's camp said the Politico story was "false". Then Cain denied there had … Continue reading Talk Back: Will sexual harassment accusations sink Herman Cain?