Well considering this would be a state crime at best, the FBI would just pass it on to the Senate for a hearing, which I'm pretty sure they've already invited her to. . .
There's really 3 possibilities here:
1) It didn't happen.
2) It did happen and it speaks to his character and more will come out with accusations.
3) He's been an upstanding citizen and some 30+ years ago as a teenager he made a bad choice and actions that were never brought to the authorities until now.
#1 is a clear confirmation. #2 we'll have a bigger news cycle and should be denial. #3 teenagers are stupid, and aggressive groping isn't a good thing, but he's reformed and been clean for a significant period of time that shows he's not that person anymore. This is a likely confirmation, but it's possible for denial.
The timing of this stinks of political tactics to delay the confirmation vote until either dems are clear of midterm elections or dems potentially take control of the senate after the midterms.
Personal stance, I don't believe it, but if the only dirt that can be brought up is from over 30 years ago when someone was a stupid teenager I don't care. 20 years ago when I was a teenager I can think of situations I and others I knew were involved in that if a cop caught us they'd give us a talking to and threaten to call our parents, but if it happened within the last couple years we'd be arrested for criminal mischief or something greater.