It helps with Hillary's war on women meme. She was poised to be attacked because Bill blatantly took advantage of a naive young intern with stars in her eyes and then attacked her when the story came out. so here comes Monica saying Bill did't exploit or take advantage of her, it was all consensual, and the big blue meanie was thet evil internet where all the right wing conspirators hang out. It was the right wing republicans that harassed and humiliated her because they are waging a war against women. Hillary was going to have to deal with the Monicagate issue eventually, better now than having it as a distraction during the campaign season.
Unless "our side" (a large percentage of whom would rather have hillary as pres than have a conservative) reinforces the "poor hillary" rhetoric, it's a miscalculation hy hillary's overly self absorbed clique.
How's this for a campaign quip? Hillary didn't know about Benghazi, she didn't know about Monica? C'mon.