Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) surged ahead of his rivals to join former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE in a statistical dead heat atop the 2020 Democratic presidential primary field, according to a new poll.

Sanders now leads the field with 27 percent support from Democrats and Democratic-leaning independents, based on the CNN national poll released Wednesday.

Sanders’s support jumped 7 points since last month, placing him in a virtual tie for first with Biden, who is at 24 percent. Sanders’s 3-point lead is within the poll’s margin of error.

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Biden’s support had dipped just 2 points since December.

Sanders has seen a fairly steady increase in support in the monthly CNN polls since August, when he registered at 15 percent. Biden had maintained a fairly steady lead over the last six months, starting at 29 percent in August, until this month’s poll when Sanders surged ahead.

The top two candidates have a significant lead over the rest of the field. Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) trailed Biden by 10 points, in third place with 14 percent. Warren’s support decreased 2 points since the December poll.

Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE trails her by 3 points at 11 percent, a 3-point uptick for the former South Bend, Ind., mayor since last month.

With just two weeks before the primary voting season begins in Iowa, no other candidates registered double-digit support in the new survey.

Former New York City Mayor Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE is at 5 percent, followed by Sen. Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.) and Andrew Yang Andrew YangDoctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls Buttigieg launches his own podcast MORE at 4 percent each. Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE is at 2 percent, and no other candidates are above 1 percent, based on the poll.

The poll surveyed 500 Democrats or Democratic-leaning independents. It was conducted between Jan. 16 and 19 and has a margin of error of 5.3 percentage points.