Scholarship on the administrative process has scarcely attended to the role that states play in federal regulation. This Article argues that it is time for that to change. An emerging, important new strand of federalism scholarship, known as “administrative federalism,” now seeks to safeguard state interests in the administrative process and argues that federal agencies should consider state input when developing regulations. These ideas appear to be gaining traction in practice. States now possess privileged access to agency decisionmaking processes through a variety of formal and informal channels. And some courts have signaled support for the idea of a special state role in federal agency decisionmaking.