There's no doubt that America's political parties have undergone a major transformation in the last two decades, and that we now have, for better or for worse, a center-left party and a center-right party(although at the moment, more right than center), pitted against one another, rather than the jumble of the past. The question is whether this process, which Ron Brownstein, until recently a columnist for the Los Angeles Times, calls the "Great Sorting-Out," is a bad thing, a good… more