Why Most Californians Aren't Happy with the State
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> The Hoover Institution ... is an American public policy think tank and research institution that promotes personal and economic liberty, free enterprise, and limited government... It is widely described as a conservative institution.
I only looked at your last two links but while less people are moving to cali, it isn't less people than than those that are moving out. Other factors mentioned above also contributed for the decline.
Honestly though, why do people mention this as a problem. I can only hope it becomes less populated. You could go to death valley on a summer tuesday afternoon and there is still a crowd somewhere.