He should make a play everywhere. That’s how you win.. not this stupid Carl rove thread the needle nonsense that they have been doing for decades now.
With that said I doubt you will see them flip CA or NY..
But maybe other blue states aren’t as blue as they seem.. maybe they have large disenfranchised voters who stopped voting when the D party went too far left for them than he can get... just like he did in the rust belt.
If Trump goes hard in California, he might take Nevada. And some congressional seats elsewhere.