Many other states have distinct regions of states, just as California does.
Suppose this idea catches on with liberals.
They might say that Chicago should secede from Illinois and be its own state. Automatic 2 Democrat senators if that happens.
Ditto, with New York, if New York City and environs became its own state, separate from upstate. Another 2 automatic Democrat senators always in the Senate.
Then there is the ongoing threat that the District of Columbia could be granted statehood. If that ever happens, another automatic 2 Democrat senators.
It's my understanding that the parts of New York State that are more than 50 miles from Central Park are majority Republican.