(Reuters)

The Wall Street Journal is out with a long article today exploring why the number of Americans on food stamps isn't falling along with the unemployment rate. As of December there were 47.8 million people enrolled in the Supplemental Nutrition Assistance Program, up more than a million over the year. So what's going on?

It's a complicated answer, and the WSJ does a good job teasing out the story's different threads. But I want to focus on the simple part of the issue for a moment, because in the big picture, it's also by far the most important part. So repeat after me: There are record numbers of Americans on food stamps today because there are record numbers of Americans in poverty (records begin in 1959.)

As of 2011, there were 46.2 million men, women, and children living below the U.S. poverty line. There isn't much reason to believe that the last year of mediocre job growth has dented that number. And until it plunges, the food stamp rolls are going to stay full -- plain and simple.

It's true that not all food stamp recipients are technically impoverished. As part of welfare reform, the Clinton administration let states relax all sorts of rules about who could qualify. Today, families that are living a bit above the poverty line or have some savings can benefit, whereas twenty years ago they'd have been excluded. Then there's the issue of "categorical eligibility," which has been a giant bugaboo for some conservatives. It lets states automatically make residents eligible for food stamps if they receive benefits from programs such as Temporary Assistance for Needy Families program (better known to most as post-Clinton welfare). And because the definition of "benefits" is fairly loose -- in some states, it might just mean the family received a brochure printed and mailed with TANF money -- some have accused states of using it as a loophole to sweep as many families into SNAP as possible.