According to an early donor list mistakenly attached to a invitation to Biden's first fundraiser in Philadelphia on April 25, the event raised tens of thousands of dollars from employees and family members of attorneys at the law firm Cozen O'Connor. The firm specializes in labor disputes, including helping employers "prepare for and respond to picket lines, strikes, lockouts, and other economic campaigns," as well as to "avoid unionization through positive employee relations." Cozen O'Connor's website notes that the firm's attorneys "manage labor relations with a clear eye toward the bottom line."

Of the $70,150 that had been pledged to Biden's campaign at the time the list was released, $46,850 came from checks signed by Cozen O'Connor employees and their family members.