HARI SREENIVASAN:

A newly released report by the Southern Education Foundation says a majority of all public school students across the United States come from low-income families. Experts say that could have important implications for the nation.

For more about that, we're joined now from Washington by Lyndsey Layton. She covered the story for The Washington Post.

So, the numbers have been getting worse over time, right? I mean, 10 years ago, it was only four states that had more than half their populations, the schoolchildren populations qualify for free or reduced lunches. Now it's 21 states.