This seems to be more about politics than anything else. Biden has always been a personable politician and the stories can be explained away. There seems to be a sameness to them.
This will not help Trump if Biden is the Democrat nominee. Trump openly brags about grabbing women and kissing them so a woman saying that Trump grabbed her is very believable. Also Trump's polices are opposed by women especially. Also Trump does not take the issue of sexual harassment seriously. His nominee to the Supreme Court committed a sexual assault and Republicans did not take it seriously. Betsey DeVos is trying to make it more difficult for women who are sexually assaulted on colleges to get justice. One of his nominees to the fed was forced out of the race due to sexual accusations and the other appears to have a tax issue.