Seems like a knee jerk partisan thing to say.
No power in the history of the world has ever decided to have less power.
They always want more.
We created a system of checks and balances to address that truism.
But what specifically did you have in mind?
As far as I know, Obama told the DOJ to back off any medical weed or similar state laws. Clearly you must have been partaking of the weed last year when several states considered lawsuits against the federal government over certain aspects of the Obama Health Care bill. Also, several states have started introducting legislation to nullify aspects of "cap-and-trade",