So, going with the presumption that Kamala will be the candidate
(because, no one else in the D party is going to get a broad base of support from the majority of the party), who would be the VP pick?
This
CBS vid lists the governors Andy Beshear, JB Pritzker, Gretchen Whitmer, Roy Cooper, Gavin Newsom, Josh Shapiro, and Wes Moore, the senators Mark Kelly and Raphael Warnock, and Biden's Secretaries Gina Raimondo and Pete Buttigieg...
I look at that list and while I've seen some of them do media interviews, etc, the only ones that stand out as being able to ad-lib and maintain a non-party dialogue are Whitmer, Newsom, and Buttigieg. Whitmer would make it into a two-woman ticket which seems bad, Newsom has that "slippery" thing going on plus having a two-Californians-ticket is an issue, and then there is Buttigieg... He doesn't seem like a bad choice unless the voters are homophobic. He could be the best VP pick, because he shows professional competence and verbal alacrity, and what could Maga say about Buttigieg besides "oh, he's gay..."? He doesn't have specific baggage for maga to exploit, and he can point out the stupid every time he is talking with a trump-bobblehead.