This is what Moore and his backers are alledging - a smear campaign of activities which took place so long ago they are no longer prosecutable.
whether they would have been prosecutable back then either is debatable. the police would need to demonstrate that (a) Moore knew his victims were underage, and (b) intended to proceed to intercourse, rather than simply offensive banter.
Moore's behavior, it appears was "common knowledge" 30 years ago, before he was famous and powerful. which kind of supports his claim that this was all perfectly timed to put a democrat in the senate.
But that does not exonerate Moore from abhorrent behavior. Based on the preponderance of the evidence, he should withdraw. And both parties should do a better job vetting their candidates on past behavior. not only sexual picadillos, but also mishandling top secret documents; accepting money from foreign powers; destruction of evidence, etc.
chalk one up to the democrats. this is entirely political, and well played. Moore is a pariah.