It creates a false equivalency in the minds of people who don't particularly want to vote left, but MSG left them feeling very uncomfortable and with uncomfortable thoughts. This gaffe lets them go back to a comfortable place of being able to vote right again. We called them trash, but they called us trash right back so it's a wash. We're mostly the same. I can turn my brain off and vote against liberal policies again.
Normally, I would say such people probably couldn't swing an election. This year, they might. It was a major fuck up by Biden, a completely unforced and unnecessary error. How many Nikki Haley voters have voted for Trump in the past and might have felt personally attacked? Just stupid to the fucking core.
He can't help Kamala anyway. He is universally hated by the right and disliked by right leaning independents. There's nothing he can do to expand her voting base. He can only hurt her at this point. He needs to take the week off if he cares about this country.