The one thing that only bothered me about these accusations is if Clinton was laughing at the victims predicament. It's her job to defend a criminal but her laughing at the victim would reveal that she has very serious issues.
SO I listened to the audio tape and this is being overblown.
The first time she laughs is at how her client passes the lie detector test. His ability to pass without any problems made the machine's practicality a joke.
The second time she laughs was after she takes the evidence (keep in mind there was a funny story behind the evidence she had to work with in the first place) to the foremost expert on bloodwork who points out while he can see a stain (after using a magnifying glass) there simply isn't enough of sample to actually do a test let alone confirm one way or the other whose blood it is.
So she goes back and tells the judge the evidence isn't permissible and would be a miscarriage of justice to use.
She's just laughing at the absurdity of how her client dodged 2 bullets in a row.
She is under no circumstances laughing about the victim.
The audio is available here?
It's as Nivash describes. In context, Hillary wasn't laughing about getting the child rapist 'free', she was laughing about how polygraphs didn't really work like she thought they would and about how the prosecution really screwed up.
Edit: If the trial itself has recordings of Hillary slandering the victim, there's none available yet as far as I can see. Currently we mostly have the grievances of the victim.
To be fair the prosecution didn't screw up at all. It was the crime lab who decided to cut out the blood soaked part of the pants and then they sent the wrong article of clothing back to the court. The prosecution got blindsided.