I wish they gave some data on domestic net migration. I wonder if there is that large of a net migration out of California or not. I suspect there is out of Southern California, but wouldn't be surprised if the Bay Area, especially the Silicon Valley, held it's ground.
There is in fact data on domestic net migration.
http://www.census.gov/popest/data/counties/totals/2011/CO-EST2011-05.html
No wonder Ohio's unemployment rate is so much better than the national average. Everyone is leaving! The domestic migration out of the state is greater than the natural increase in population.