I'm always for separating.

I also want to separate from northern Wisconsin and have a similar relationship that WI has with MN right now.

Never happen. Too many parts.

I like the idea. Congress, however, would likely prefer a 5 state solution, to maintain the net Senate balance of power -- 3 Dem states and 2 GOP states. Jefferson would likely be too low in population to be accepted and would be included with North California. That would result in 3 Dem states (North California, Silicon Valley, West California), 1 GOP state (Central California), and 1 tossup (South California)...

I also prefer splitting Florida into 3 states --
1) South Florida (4 leftist counties with 8 congressmen)
2) West Florida (GOP, panhandle and west coast with Tampa Bay -- 11 congressmen)
3) East Florida (GOP, east coast with Gainesville, Orlando, Jacksonville -- 8 congressmen)

No idea, just commenting on this part of the article:
"If California did vote for the change, it would then be up to the US Congress to authorise the new states' inclusion into the union which opponents say is also unlikely."

Why would they not be allowed into the union, assuming that they even want to be?

I liked the comment that if successful it's doubtful that the new states would be allowed in the USA union.
Is this a unique approach to secession?
Jefferson is a great name for a new country!