Written for a dispersed agrarian population using hand tools in a local economy, our Constitution now controls an American government orders of magnitude larger that has had to respond to profound changes in transportation, communication, technology, economy, and scientific understanding. How did our government get to this place? The agencies Congress has created to meet these changes now face profound new challenges: transition from the paper to the digital age; the increasing centralization in an opaque, political presidency of decisions that Congress has assigned to diverse, relatively expert and transparent bodies; the thickening, as well, of the political layer within agencies themselves; and the increasing judicial use of analytic techniques invoking the expectations of those who wrote the Constitution so long ago and in such different circumstances. Never easy, finding the appropriate balance between law and politics presents major challenges today.