Sanders cancels Jackson, MS even though the mayor endorsed him.
Neither candidate had a strategy for actually winning the black vote, only for mitigating losses while dominating the progressive lane. Eleven months ago, the Sanders campaign sketched out a scenario in which Sen. Cory Booker of New Jersey and Sen. Kamala D. Harris of California took black votes away from Joe Biden, allowing the senator from Vermont to perform just strongly enough to win a plurality of delegates. In the final days before the South Carolina primary, the campaign saw Tom Steyer, whose well-funded and quixotic campaign focused on black voters, restoring their chance of winning without the black vote. It simply didn't happen.
After Tuesday, Sanders appeared to scale back his ambitions with black voters, canceling a trip he had planned for Jackson, Miss. That location had been meaningful: Sanders was endorsed by its mayor, Chokwe Antar Lumumba, a radical, rising star in the party, who had invited Sanders to the city two years ago to talk about civil rights and political reform. The new left-wing movement that had been built since 2008, benefiting both Warren and Sanders, had produced plenty of stars, and driven the entire party to the left.
https://www.washingtonpost.com/politics/paloma/the-trailer/2020/03/05/the-trailer-the-problem-in-the-progressive-lane/5e611e98602ff10d49ac3bf5/