It's a moot point now, but I saw Michelle Obama as a possible and formidable V P pick. But I think she's enjoying the easy gig she has right now, too much to throw it away for the questionable honor of being Biden's V P pick.

And if she were to be V P, a lot of that easy popularity would be swept away, and her radicalism fully vetted, that would hurt her in any other venture, even after the VP venture went south in a humiliating defeat. She would be vetted in a way she was not as first lady, and her vile radicalism would be on full display.
https://dailycaller.com/2019/10/30/michelle-obama-white-folks-fleeing-non-whites/
And many who like the image she is allowed to have now, would be repelled by her radicalism if she were fully vetted.

And

https://www.cbsnews.com/news/the-bad-company-of-barack-obama/

For such an entitled and well-moneyed black woman, who's had a relatively easy path and coasted into lucrative jobs thanks to friends in high places like Valerie Jarrett, she really is a sadly angry woman, who gropes for things to be mad about.