The United States has a written Constitution, as in, written down, which has been a wonderful firewall and blessing. But America also has, as all nations do, an unwritten constitution. That unwritten covenant is the only thing that makes the Constitution itself worth anything more than the paper it is written on. There are certain assumptions embedded in our national psyche that have to be taken into account if you want to understand what our radicals are attacking with such ferocity, and what our conservatives, still being their lovable and bewildered selves, are dimly trying to defend.