30 or 40 years ago, you had a pretty good sense of whom somebody would vote for by asking them a question about economics. Now what's more predictive of who you're voting for is your opinion about a question like immigration. Is this simply a shift in where the thought line between the left and the right lies? And it makes as easily for a stable Democratic politics once we've gotten used to it?, he asks. Or do you think that there's something a fundamentally problematic, fundamentally concerning about the way in which the left has become, in certain ways, the voice of the upper-middle-class professionals?