The issues raised in the previous posts are mostly news to me, although I've heard rumblings on DU about Sirota's rough treatment of others as a Sander's employee. Mostly when he went off the radio, he disappeared with a few TV appearances now and then. But check out his Wikipedia page! Evidently he's been all over, from Huffpost to Colbert. Near the end of the article, we learn that he was a subject of an episode of the Goldbergs!
https://en.wikipedia.org/wiki/David_Sirota
The thing I liked about Sirota is that he has been right about America's involvement in the two bush Iraq wars. (He's the kind of Liberal I aspired to be.) Radio personality Jay Marvin called him the "smartest man in the world. " The OP says, he "had written for a racist 20 years ago." That doesn't mean that Sirota IS a racist. In fact he has progressive views like everyone. Check out the Wikipedia article.
BTW, Sirota has apologized for working for the racist:
https://www.politico.com/story/2019/03/22/sanders-speechwriter-racially-inflammatory-website-1232953
"In a 1999 mayoral race in Philadelphia, Sirota was tied to a fake website apparently intended to scare off white residents from voting for a black opponent. On Friday, the controversial political aide and journalist apologized for his role in the episode."
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