If they are going with Newsome they better get a move on it.
Nah.
The shot is to keep what's left of GOP opposition keyed up on "Biden this, Biden that, FJB, hate Joe Biden, look at Hunter's penis" until the convention, when the Newsom/Whitmer ticket will be announced.
They want the ticket exposed to scrutiny for the shortest period of time, and remember, voting starts 3 weeks after the convention.