You can't convict anyone for anything except murder 40 years after the fact. Statute of limitations.
If someone sexually assaults you be it a fellow student, Catholic priest, movie producer, Bill Cosby, or whatever, speak out then and don't wait 40 years.
The dems had this info during the hearings. That was the time to bring the allegation up. They probably didn't find it to be credible enough. This is a desperation move. That liar can't even say when and where the incident took place.