There is a growing sense that it is now a matter of when rather than if Mr Biden will throw his hat into the ring.
“I have known Joe Biden for a long time and I think he will run,” said Lou D’Alessandro, a politician in New Hampshire, which holds the first Democratic primary next year.
Over the past few weeks, New Hampshire has seen a procession of Democratic candidates meeting voters as they try to steal a march on their rivals.
“I do think he is leaning towards running. He has a lot of friends in New Hampshire from his many years in public life,” Mr D’Alessandro told the Telegraph.
“I am sure there are people in place. It would not take long to get an organisation up and running.”