Conservative politicians and analysts are spouting their usual denial. Gov. Rick Perry and Representative Michele Bachmann have called for taxing the poor and near poor more heavily, on the false grounds that they have been getting a free ride. In fact, low-income workers do pay up, if not in federal income taxes, then in payroll taxes and state and local taxes.

Asked about the new census data, Robert Rector, an analyst at the conservative Heritage Foundation told The Times that the “emotionally charged terms ‘poor’ or ‘near poor’ clearly suggest to most people a level of material hardship that doesn’t exist.” Heritage has its own, very different ranking system, based on households’ “amenities.” According to that, the typical poor household has roughly 14 of 30 amenities. In other words, how hard can things be if you have a refrigerator, air-conditioner, coffee maker, cellphone, and other stuff?

The rankings ignore the fact that many of these are requisites of modern life and that things increasingly out of reach for the poor and near poor — education, health care, child care, housing and utilities — are the true determinants of a good, upwardly mobile life.

Government surveys analyzed by the Center on Budget and Policy Priorities indicate that in 2010, just over half of the country’s nearly 17 million poor children lived in households that reported at least one of four major hardships: hunger, overcrowding, failure to pay the rent or mortgage on time or failure to seek needed medical care. A good education is also increasingly out of reach. A study by Martha Bailey, an economics professor at the University of Michigan, showed that the difference in college-graduation rates between the rich and poor has widened by more than 50 percent since the 1990s.

There is also a growing out-of-sight-out-of-mind problem. A study, by Sean Reardon, a sociologist at Stanford, shows that Americans are increasingly living in areas that are either poor or affluent. The isolation of the prosperous, he said, threatens their support for public schools, parks, mass transit and other investments that benefit broader society.