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So-called socialist Bernie Sanders urges left to back President Biden for reelection
(www.theguardian.com)
News from within the empire - From a leftist perspective
It wouldn't change him from being a socdem, but if he gave Biden an ultimatum for his endorsement then I'd get it.
(E.g. "Joe, I'll endorse you but only if you universally cancel student and medical debt before the election")