LOL, It's So Atlas to think anyone is going to vote off based what some random staffer did 3 months before the election. It's not like it was Davis himself assaulting random people at bars.
It's certainly something the Democrat could turn into ads and pound him with for all of October, but I think if Davis was ever going to lose, he'd still lose without this incident being weaponized against him. His district is around Trump+5.5 and Romney+0.3. This is exactly the kind of district that would be highly vulnerable in a Democratic wave year.