I don’t think the original poster, is talking about a north/south split.
What’s the point of that?
You’ll have two liberal-majority states, which are still controlled by one party.
Split California directly into blue state Cal, and red state Cal.
There will need to be serious discussions about how that is done — for example you can’t just have two blue blotches surrounded by red (although that represents California) — probably you’ll need to keep a corridor open between the two major metropolitan areas, or it just won’t be feasible.
It may mean giving up the central coastline, but frankly all that area is pretty liberal too. Santa Barbara. Ventura. San Luis Obispo.
I really, really like this idea.
Bump to two state idea.