
Senator Elizabeth Warren comes in fourth at 9 per cent followed by former New York City Mayor Michael Bloomberg, who is at 7 per cent.
The poll, which surveyed 1,859 voters, was taken between November 27 and 29.
If Clinton stayed out of the race, Biden maintains his advantage with 29 per cent followed by Sanders, who gets 15 per cent. Warren comes in third at 13 per cent.
Last week, Clinton refused to completely rule out a late entry into the field of candidates.
During media appearances in the United Kingdom last month, Clinton twice hinted that she could still make a late entry into the field.
Speaking on the BBC's Graham Norton Show in London on November 29, Clinton said she would 'have to make up my mind really quickly', if she was going to join the race.
Earlier last month when the former first lady and her daughter Chelsea were promoting their work, The Book Of Gutsy Women, she appeared on BBC Radio Five Live.