A Civiqs poll released on the eve of the Iowa caucuses shows Sanders with a healthy lead, while Joe Biden trails considerably.
Of the 615 potential Iowa Democratic caucusgoers who responded to the poll, 28 percent said they would vote for Bernie Sanders. 21 percent said they would support Elizabeth Warren, while Joe Biden and Pete Buttigieg tied for third with 15 percent support.
Amy Klobuchar, who has seen an increase in support in some polls, remained flat in the Civiqs survey at just 8 percent. Andrew Yang finished sixth with 5 percent.
While 61 percent say their mind is made up, 23 percent said they could be persuaded to change who they support, while 14 percent are undecided.
The Iowa caucuses take place Monday night.