In the days ahead, Team Clinton will plant negative stories about Biden: for instance, the stories could involve friends and family members who have gained from his influence.
The message: if you run, we will hurt you. The goal: to deter him from running.
Biden and Clinton both ran for the nomination in 2008, so we know that the Team Clinton already has an oppo file on him. (They did not have to use it then, since he never was a serious threat.) We also know that the Clintons do not hesitate to smack down opponents.