By not hating her.  The thing that drove the Republicans insane was that the more they hated Bill Clinton, the more he beat them and kept beating them.

With Hillary, New Hampshire is your best example of that.  The hatred went so far over the top, all over the media, that women backlashed hard.

It will happen again and again.  

You have to understand her, give her a fair due, and then show how much more attractive other candidates are.

Hillary Hatred feeds the beast.  Her campaign knows this.  Why do you think they keep the petty squabbles alive?