Tammie Hagen-Noey, in her bedroom at a group home in Richmond, Va., earns $7.25 an hour at a local McDonald’s.Credit...Drew Angerer for The New York Times WASHINGTON — Is a family with a car in the driveway, a flat-screen television and a computer with an Internet connection poor? Americans — even many of the poorest — enjoy a level of material abundance unthinkable just a generation or two ago. T