Sanders leads in Iowa ahead of caucus: poll

Sen. Bernie SandersBernie SandersTrump says Biden has been 'brainwashed': 'He's been taken over by the radical left' Ex-Sanders campaign manager talks unity efforts with Biden backers The Hill's Campaign Report: Florida's coronavirus surge raises questions about GOP convention 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 says Biden has been 'brainwashed': 'He's been taken over by the radical left' Trump says he'll wear mask during upcoming trip to Walter Reed Latino group 'Mi Familia Vota' launches M voter turnout campaign targeting swing states 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 WarrenThe Hill's Campaign Report: Democratic Unity Taskforce unveils party platform recommendations Progressive activist Ady Barkan endorses Biden, urges him to pick Warren as VP Congress must act now to fix a Social Security COVID-19 glitch and expand, not cut, benefits 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 KlobucharBiden strikes populist tone in blistering rebuke of Trump, Wall Street The Hill's Coronavirus Report: Teachers' union President Randi Weingarten calls Trump administration plan to reopen schools 'a train wreck'; US surpasses 3 million COVID-19 cases The Hill's Coronavirus Report: DC's Bowser says protesters and nation were 'assaulted' in front of Lafayette Square last month; Brazil's Bolsonaro, noted virus skeptic, tests positive for COVID-19 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 ButtigiegBiden strikes populist tone in blistering rebuke of Trump, Wall Street Buttigieg's new book, 'Trust,' slated for October release Biden hires top aides for Pennsylvania MORE (D) surged 5 points to take third place in the poll.

Businessman Andrew YangAndrew YangBiden campaign to take over 'Supernatural' star's Instagram for interview Hillicon Valley: Justice Department announces superseding indictment against WikiLeaks' Assange | Facebook ad boycott gains momentum | FBI sees spike in coronavirus-related cyber threats | Boston city government bans facial recognition technology The Hill's Campaign Report: Progressives feel momentum after primary night MORE and billionaire Tom SteyerTom SteyerThe Hill's Campaign Report: Jacksonville mandates face coverings as GOP convention approaches Steyer endorses Markey in Massachusetts Senate primary Celebrities fundraise for Markey ahead of Massachusetts Senate primary 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.