Extreme talk, especially as practiced by a genuine talent like Beck, squeezes maximum profit from a relatively small, deeply invested audience, selling essentially the same product in multiple forms. The more the host is criticized, the more committed the original audience becomes. And the more committed the audience, the bigger target it presents to the rant industry on the other side of the spectrum.

Our hot summer of political combat is turning toward an autumn of showdowns over some of the biggest public-policy initiatives in decades. The creamy notions of postpartisan cooperation — poured abundantly over Obama’s presidential campaign a year ago — have curdled into suspicion and feelings of helplessness. Trust is a toxic asset, sitting valueless on the national books. Good faith is trading at pennies on the dollar.