Nowhere near as much. Not even close. Johnson only got elected because of sympathy about Kennedy. He got 61% of the popular vote. You don't get that high a popular vote just for taking over for Kennedy for a year unless people feel really bad about the loss of Kennedy.
I don't know, zombies don't usually inspire much sympathy... though, if I were American, I would vote for zombie Biden.
(I'm not sure what the constitution says about the living dead holding office, but then again Reagan might have set some sort of precedent towards the end of his second term...)
Original post: Between this and Johnson saying Biden should resign as president, it makes me think they are trying to limit Harris to one term. If Biden were to die or resign then Harris would become president for a few months but that would still count as her first term, so she wouldn't be able to run for reelection in 2028 if she won this time.
That's my theory anyway 🤷♀️