PBSFormer Secretary of State Hillary Clinton and Sen. Bernie Sanders (I-Vermont) had a terse back-and-forth near the end of the Thursday-night Democratic presidential debate, during which Sanders accused Clinton of a "low blow." Clinton took an opportunity to rip Sanders over his past criticism of President Barack Obama. In an NBC interview that aired Thursday, Sanders took a slight dig at Obama for supposedly failing to close the "presidential leadership gap" between Congress and the American public. "This is not the first time he has criticized President Obama," Clinton said. Clinton referenced past comments from Sanders in which he called Obama "weak." She also pointed to a blurb Sanders wrote lauding the 2016 book, "Buyer's Remorse: How Obama Let Progressives Down." "I don't think he gets the credit he deserves for being a president who got us out of that ditch, put us on firm ground, and sent us into the future," Clinton said, noting that Obama came into office in the midst of a deep recession.