Why is Arkansas, of all states, becoming the Obamacare poster child?

Arkansas is quickly becoming Obamacare's poster child.

The state's innovative Medicaid expansion — which uses the public program's dollars to buy enrollees private coverage — has cut the uninsured rate nearly in half and become a model for other red states. Mark Pryor, Arkansas's vulnerable Democratic senator, is running on health reform. And on Tuesday, news broke that insurance premium