This article is part of “Unaffordable America,” a series examining rising economic inequality in the U.S. and the policies that drive it. PHOENIX — The line outside a suburban office building was already 15 people long when Tiffany Hudson showed up with her 7-year-old son cradling his blanket. It was 7 a.m. At the front of the line was a woman hooked up to an oxygen tank who had arrived 90 minutes before the building opened. Like others there, Husdon had come to the Arizona Department of