Red states in the Southeast and Sunbelt are following the Reagan model by reducing tax rates and easing regulations. They also offer right-to-work laws as an enticement for businesses to come and set up shop. Meanwhile, the blue states of the Northeast, joined by California, Minnesota and Illinois, are implementing the Obama model of raising taxes on businesses and the wealthy to fund government "investments" and union power.

The contrast sets up a wonderful natural laboratory to test rival economic ideas.

Consider the South. We predict that within a decade five or six states in Dixie could entirely eliminate their income taxes. This would mean that the region stretching from Florida through Texas and Louisiana could become a vast state income-tax free zone.

Three of these states--Florida, Texas and Tennessee--already impose no income tax. Louisiana and North Carolina, both with bold Republican governors and legislatures, are moving quickly ahead with plans to eliminate theirs. Just to the west, Kansas and Oklahoma are also devising plans to replace their income taxes with more growth-friendly expanded sales taxes and energy extraction taxes. Utah, while not a Southern state, leads the tax-cutting pack under Republican Gov. Gary Herbert.

Much of this is the result of GOP victories in the 2010 and 2012 elections. Today 10 of the 12 governors in the Southern states are Republican, and in nine of those states the Republicans control both chambers of the legislature.