Judging by the careful and qualified reactions of the left-friendly Julian Sanchez and Dave Weigel, the answer might just be yes. It's a truism nowadays that everything wrong with American culture is driving us deeper and deeper into narrow, self-selecting, self-congratulatory cubbyholes. There's no doubt that the distinctions among our political alternatives are, like our tongues, getting sharper and sharper. But at the same time, the old battle lines are shifting as circumstances change and fertile new ideas spread and interact. Our national arguments are becoming less productive in some ways and more productive in others. And that's not a wash; the phenomenon points toward some of the productive political ground of the next several years -- if not beyond.