Edit: It seems I may be wrong after all.

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 🤷‍♀️