Bernie Sanders is right: Bill Clinton’s welfare law doubled extreme poverty

After 20 years, Bernie Sanders wants to put welfare back on the national agenda, seeing a chance to use his message of economic equality to undermine Hillary Clinton's base of support among black voters.

Primaries across the South over the next few days give him what might be the best chance he'll get. Hundreds of thousands of Southern families are living on less than $2 in cash a day as a result of legislation President Bill Clinton signed in 1996, according to new research by Johns Hopkins University's Kathryn Edin and University of Michigan's Luke Shaefer.

In South Carolina this week, ahead of that state's primary election on Saturday, Sanders brought up the 20-year-old law in a press conference. "What welfare reform did, in my view, was to go after some of the weakest and most vulnerable people in this country," he said on Wednesday, noting that Hillary Clinton, the former first lady and his rival for the Democratic presidential nomination, supported the legislation.