The problem is doing this as a member of congress to young staff, no way this could be anything but ackward and intimidating. Very inappropriate. Embarrassing, maybe caused staff to quit. But cause him to resign? No, not by itself. Even with current focus on sexual predators on the Hill, this seems a reach. Maybe there was more involved?
Bizarre? yes. A mistake? Yes. Reason to resign? Hell no.
When one looks at what scum in Congress have gotten away for years it seems out of balance to insist on such perfection in the area of sexual harrassment yet when it comes to other matters ... not so much.