Paul Krugman writes in the NY Times about a new book called Polarized America.
So what's our bitter partisan divide really about? In two words: class warfare. That's the lesson of an important new book, "Polarized America: The Dance of Ideology and Unequal Riches," by Nolan McCarty of Princeton University, Keith Poole of the University of California, San Diego, and Howard Rosenthal of New York University.
"Polarized America" is a technical book written for political scientists. But it's essential reading for anyone who wants to understand what's happening to America.
What the book shows, using a sophisticated analysis of Congressional votes and other data, is that for the past century, political polarization and economic inequality have moved hand in hand. Politics during the Gilded Age, an era of huge income gaps, was a nasty business — as nasty as it is today. The era of bipartisanship, which lasted for roughly a generation after World War II, corresponded to the high tide of America's middle class. That high tide began receding in the late 1970's, as middle-class incomes grew slowly at best while incomes at the top soared; and as income gaps widened, a deep partisan divide re-emerged.
