precedent goes both ways though and I fully expect that if the Dems pulled it off it's not like the Republicans(how do you shorten that easily?) would NOT respond in kind, they totes would.
frankly I'm of the opinion that this sunk any chance at all that the Dems had of actually blocking Kavanaugh. If anyone let an unsubstantiated claim like the ones against Kavanaugh block him we'd very quickly not have a Supreme Court.