I wouldn’t say zero penalty; his poll numbers are shit. They were before the story leaked, but nobody seems to be Teflon the way Trump is. He’s possibly tanking North Carolina down ballot, and could even flip the state for Kamala. His political career is surely finished. It would have been before now if the GOP had their way, they tried really hard to get him to drop out.
I’ve heard rumors that it was leaked by the GOP specifically to get him to drop out before it was too late, but he’s a stubborn Trumper, so I hope they’re enjoying the beast they created.