“The United States today is home to two huge but essentially invisible populations. Each of them is widely stigmatized and largely composed of people living in the shadows. The government does not know who they are, where they are or how well they are doing.
“The first of these invisible tribes — illegal immigrants — at least has attracted more than passing comment in politics. By contrast, America’s second invisible caste is almost never mentioned. Yet this group is far larger than the unauthorized immigrant population, and it is made up almost entirely of U.S. citizens.”