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Joe Biden and Bernie Sanders clashed over health care in Thursday night's Democratic debate—but an exchange with another Sanders is getting a lot of attention. After Biden demonstrated a stutter while talking about helping children with who struggle with stutters, former White House press secretary Sarah Sanders tweeted: "I I I I I I I I I I I I I I I hhhave absolutely no idea what Biden is talking about." Biden fired back soon after the debate ended, the Guardian reports. "I've worked my whole life to overcome a stutter. And it’s my great honor to mentor kids who have experienced the same," he tweeted. "It’s called empathy. Look it up." The Hill reports that Sanders later apologized, saying: "I actually didn’t know that about you and that is commendable." (Read more Sarah Huckabee Sanders stories.)