How about Michelle Obama, everyone's darling on the left? Publicity-wise, it wouldn't be a bad idea from a left-wing perspective. She's quite famous, wrote books, her face has been everywhere since 2008 (which seems to be more important than anything else these days).
Mark my words, it'll be her replacing him should the Dems push Biden aside.
Which will only expose the idiocy of identity politics even further. Kamala Harris strikes me as incompetent and devious, but compared to that woman she'd be the better choice. At least Harris has spent some time working in the judiciary and the executive branch, so she'd be better qualified for a government position than Michelle Obama, whose main claim to political relevance seems to be her husband.
My goodness. The Kennedys, the Clintons, the Bushs, the Obamas, the Bidens, the Trumps …
I'll never understand why America, a country birthed by revolution, keeps coming back to these quasi-royal families. And that's absolutely not a "liberal elites" kind of thing, by the way. Back in 2016, Trump immediatedly appointed his family members as advisors, and I'll be damned if that equally foul-mouthed son of his won't make a bid for the presidency at some point in time.