Her opponents can use it against her in the Primary Elections.Good, she should get it out of the way now. By the time the next election rolls around, this will be a dead issue (HRC and the DNC will claim "we've already covered all of this") and won't effect her election. Anyone bringing it up will be castigated by the media for dredging up old news. In the eyes of her handlers, better to get all the dirty laundry out in the open now, so it has time to become old news before the election ramps up.