My guess is that Bill will be a pretty clear net positive for Hillary on the campaign trail. The only people who care about Monica Lewinsky at this point wouldn't vote for Hillary anyway, and he gives her campaign a badly needed shot of personality.
You?
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I disagree.
It removes one of the more useful weapons in Hillary's arsenal, ie The mythical Republican War on Women.
Hillary, especially as the potential "First Woman President" could have gotten a lot of mileage out of that one.
Now, with BIll AND ESPECIALLY HER VICIOUS SUPPORT OF HIM, she will not.
Expert her and her lackeys in the media to try to gin it up every now and then, and for Trump or his operatives to easily shoot it down.