Sanders leads in Iowa ahead of caucus: poll

Sen. Bernie SandersBernie SandersDrugmaker caps insulin costs at to help diabetes patients during pandemic The Hill's Campaign Report: Wisconsin votes despite coronavirus pandemic Sen. Brown endorses Biden for president MORE (I-Vt.) remains the top choice for Iowa Democrats a day before voters head to caucuses across the state, according to a new poll.

An Emerson College poll released Sunday night found Sanders leading the field with the support of 28 percent of respondents, while former Vice President Joe BidenJoe BidenTrump shakes up WH communications team The Hill's Campaign Report: Wisconsin votes despite coronavirus pandemic The Intercept's Ryan Grim says Cuomo is winning over critics MORE remained in second place with 21 percent, unchanged from the same poll a week ago.

Sanders saw his support dip slightly from 30 percent in last week's poll. Sen. Elizabeth WarrenElizabeth WarrenHillicon Valley: Schiff presses intel chief on staff changes | Warren offers plan to secure elections | Twitter's Jack Dorsey to donate B to coronavirus fight | WhatsApp takes steps to counter virus misinformation Warren releases plan to secure elections during coronavirus pandemic On The Money: Trump officials struggle to get relief loans out the door | Dow soars more than 1600 points | Kudlow says officials 'looking at' offering coronavirus bonds MORE (D-Mass.) has gained 3 percentage points since the previous survey. She remains in fourth place in Saturday's poll after previously falling behind Sen. Amy KlobucharAmy Klobuchar Klobuchar's husband recounts battle with coronavirus: 'It just suddenly hit me' Hillicon Valley: Schiff presses intel chief on staff changes | Warren offers plan to secure elections | Twitter's Jack Dorsey to donate B to coronavirus fight | WhatsApp takes steps to counter virus misinformation Wisconsinites put lives on the line after SCOTUS decision MORE (D-Minn.) last week.

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Klobuchar, meanwhile, saw her support drop 2 points over the week, while former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegButtigieg launches new PAC to aid down-ballot candidates HuffPost political reporter on why Bernie fell way behind Biden Economists fear slow pace of testing will prolong recession MORE (D) surged 5 points to take third place in the poll.

Businessman Andrew YangAndrew YangJack Dorsey committing billion to coronavirus relief efforts Campaigns face attack ad dilemma amid coronavirus crisis Andrew Yang: Calling coronavirus 'China virus' only used to incite 'hostility' MORE and billionaire Tom SteyerTom SteyerProgressive advocates propose T 'green stimulus' plan Candidates want data privacy rules, except for their own campaigns Budowsky: Biden should pull together a 'dream team of rivals' MORE registered support from 5 percent and 4 percent of voters, respectively, while no other candidates polled higher than 1 percent.

The survey was taken between Jan. 30 and Feb. 2 and polled 853 likely Democratic caucusgoers in the state. The margin of error is 3.3 percentage points.