Unger still wants to answer the young Marx’s call upon philosophers not just to understand the world, but to change it. Wills wants to walk the same path that Unger, with impressive clarity, has marked out – for instance in the six minutes of the YouTube that few even of the mediating intellectuals will consider – but Wills wants to walk it more slowly and carefully, lest America take a detour into Rick Perry’s Texas, perhaps never to emerge, perhaps to dwell there needlessly long at needless cost. The President… has appointments.