The biggest contrast between the two states shows up in "net internal migration," the demographer's term for the difference between the number of Americans who move into a state from another and the number who move out of it to another. Between April 1, 2000, and June 30, 2007, an average of 3,247 more Americans moved out of California than into it every week, according to the Census Bureau. Over the same period, Texas saw a net gain, in an average week, of 1,544 people. Aside from Louisiana and Mississippi, which lost population to other states because of Hurricane Katrina, California is the only Sunbelt state that had negative net internal migration after 2000. All the other states that lost population to internal migration were Rust Belt basket cases, including New York, Illinois, New Jersey, Michigan, and Ohio.

This outmigration has to do with taxes. Besides Mississippi, every one of the 17 states with the lowest state and local tax levels had positive net internal migration from 2000 to 2007. Except for Wyoming, Maine, and Delaware, every one of the 17 highest-tax states had negative net internal migration over the same period. Conservative researchers' technical explanation for this phenomenon is: "Well, duh." Or, as Arthur Laffer and Stephen Moore wrote in the Wall Street Journal earlier this year: "People, investment capital and businesses are mobile: They can leave tax-unfriendly states and move to tax-friendly states."

American Legislative Exchange Council, Laffer and Moore pointed out that between 1998 and 2007, the states without an individual income tax "created 89 percent more jobs and had 32 percent faster personal income growth" than the states with the highest individual income-tax rates. California's tax and regulatory policies, the report predicts, "will continue to sap its economic vitality," while Texas's "pro-growth" policies will help it "maintain its superior economic performance well into the future." The clear implication is that California should become more like Texas.