His progressive staffers had little to do with Biden's major policy accomplishments. These initiatives for the most part were led by his cabinet members and agency directors.
https://www.politico.com/news/magazine/2024/02/02/joe-biden-30-policy-things-you-might-have-missed-00139046
https://www.semafor.com/article/11/06/2024/democrats-ask-why-didnt-anything-workBiden, who the party’s left opposed in the 2020 primary, had pleasantly surprised them; he had walked a UAW picket line, appointed antitrust activists to key government roles, and approved trillions of dollars of climate, infrastructure, and welfare spending. He did this in consultation with activists who saw Biden burying the neo-liberal politics that defined his career. And Democrats saw working class voters move toward Trump, running on nostalgia for pre-COVID prices and a suite of new tax cuts.
“Democrats delivered on an economic agenda,” said Analilia Mejia, the director of the Center for Popular Democracy, a progressive nonprofit built from the remnants of the old anti-poverty group ACORN. “The Biden administration was one of the most progressive administrations in my lifetime.”
But there wasn’t just one “progressive movement” in the Biden years. Democrats embraced the Black Lives Matter movement; on his first day, Biden signed an executive order centering “racial equity” in the post-COVID recovery. They embraced immigrant rights movements, and delivered on a promise – initially – to slow down deportations of illegal border-crossers. They embraced criminal justice reform movements that had elected the sorts of progressive prosecutors that Californians just threw out. In 2020, Harris endorsed LA County DA George Gascon, saying he would “decrease the state prison population and get people convicted of nonviolent offenses greater opportunities to get their lives back on track.” This year, as he tumbled toward defeat, she took no position on his race.