They face challenges and they want to try a new approach to addressing climate related issues or raising student achievement. If there is a challenge and you got a new policy idea, try it out in one state and see what works and what needs to be changed rather than at the whole national level. The U.S is a large country where states vary, not all states have the same things appeal to them. States have a better sense of what their people want, state legislatures is in better contact with their people than congress