Women voters resist two lousy candidates
Trump probably overstates Hillary Clinton's support from women. She would be a sure loser against almost any other candidate than Trump. Trump has managed to alienate women voters on an unprecedented scale, but Trump has down that with Hispanics and many Republican voters too. I suspect that is one reason why many in the media are eager to see him get the nomination seeing it as Hillary's best chance. If they are the two nominees, it will probably be a very low turnout election. It would be a mandate for nothing.
Research comparing two campaign ads, both on the theme of women, finds one far more effective at stirring up emotion and changing views of the candidates.