4:04
Sanders, saying she was trying to explain what she meant, then tweeted, \"To be clear was not trying to make fun of anyone with a speech impediment. Simply pointing out I can’t follow much of anything Biden is talking about.\"
After that, she responded to Biden, tweeting, \"I actually didn’t know that about you and that is commendable. I apologize and should have made my point respectfully,\" Sanders wrote on Twitter.
![\"PHOTO:](\"http://a.abcnews.com/images/Politics/sanders-4-gty-er-190523_hpEmbed_3x2_384.jpg\")
The former vice president has been vocal about his struggles to overcome stuttering since he was a child, recently being interviewed for a profile in The Atlantic where he talked extensively about stuttering with an author who is also a stutterer.
\"I know what it feels like to be marginalized -- marginalized. When you [intentionally stutters] talk, talk, talk, talk like that as a child, as a kid, everybody makes -- just makes fun of you,\" he said at a recent event in Iowa.
ABC News' Molly Nagle and John Verhovek contributed to this report.
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