 is being now amplified by the Biden campaign team and other surrogates, and the people who signed it are all big Biden supporters from the past. There's economist Joseph Stiglitz, Columbia University professor. He spearheaded the letter. Previously, he signed a letter supporting Biden's Build Back Better agenda, donated $1,250 to the Biden Fund in 20. Between 04 and 20, he donated over $90,000 to Democrat candidates.