“That’s the spirit that I want to reclaim for the country as a whole,” Mr. Obama told the National Governors Association, gathered in Philadelphia. “One where states are testing ideas, where Washington is investing in what works, and where you and I are working together in partnership on behalf of the great citizens of this nation.”

Showing fealty to the Founding Fathers’ concept of federalism and states’ roles in a divided government is the latest statement of humility and outreach from Mr. Obama during his transition. It’s one olive branch Republicans said they hope to grab as Mr. Obama seeks to make good on his campaign pledge of change.