Strategically, I prefer Shapiro or Cooper. Personally, I prefer Buttigieg, so I voted for him.
Also, I just learned that the 12th Amendment pretty much precludes Newsom from filling the VP role in this instance (plus I think he's saving himself for a presidential run in 2028). It states that the presidential and vice-presidential candidate on the same ticket can't both reside in the same state as where the electors reside. Well, they can technically, but it would null and void the electoral votes from that state. And the D's definitely can't afford that net -54 in their vote column.
https://constitution.congress.gov/constitution/amendment-12/