One thing to keep in mind whenever Newsom is mentioned as Biden's replacement nominee.
The Constitution doesn't permit the President and Vice President to be from the same state regardless of party affiliation.
12th Amendment to the US Constitution -- 1st paragraph;
The Electors shall meet in their respective states, and vote by ballot for
President and Vice-President, one of whom, at least, shall not be an
inhabitant of the same state with themselves; they shall name in their
ballots the person voted for as President, and in distinct ballots the person
voted for as Vice-President, and they shall make distinct lists of all persons
voted for as President, and all persons voted for as Vice-President and of
the number of votes for each, which lists they shall sign and certify, and
transmit sealed to the seat of the government of the United States, directed
to the President of the Senate;
Translation: the electors from Hawaii cannot cast their electoral votes for both president and vp if both candidates are residents of the electors' home state. They'd have to choose an out-of-state candidate to vote for in one race or the other or abstain from voting for one altogether -- probably VP.
There have been instances of presidential or VP candidates changing their legal state of residence in order to comply with this rule.
Having said all of that, Gov. Newsom is obviously a CA resident, but so is VP Cackleberry Harris.
That means if Newsom becomes the nominee and if Harris remains on the ticket, CA electors will be prohibited from casting their electoral votes for both President and VP. Since CA has so many electoral votes, that scenario would be a major problem for the dems.
So, if Newsom does wind up as the nominee, Harris would be forced to step aside so Newsom could name his own running mate.
Food for thought. Makes an already messed up election even messier.