Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) is closing in on former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE’s lead in Nevada, according to a new poll of likely Democratic caucusgoers released Tuesday.

Biden is in first place, at 19 percent, in the Suffolk University–USA Today poll, but Sanders is at 18 percent, within the margin of error.

Sen. Elizabeth Warren Elizabeth WarrenWarren, 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 No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) finished third, with 11 percent of the vote.

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Former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen 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 A socially and environmentally just way to fight climate change MORE (D) and billionaire philanthropist 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 are tied in fourth, at 8 percent each. They’re trailed by Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.) and tech entrepreneur 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, who are each at 4 percent, based on the poll.

No other candidates received more than 2 percent in the poll.

With the caucuses just over a month away, on Feb. 22, 22 percent of those surveyed said they are still undecided.

The USA Today poll comes as the RealClearPolitics average of polls has Biden leading Sanders by 8.6 points in the state. A Fox News poll of Nevada released last week showed the former vice president maintaining his lead with 23 percent support, with Sanders trailing at 17 percent.

Recent polls have also shown a surge in support for Sanders in Iowa. A Des Moines Register–CNN poll released last week showed Sanders in the lead with 20 percent support of likely caucusgoers.

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Biden was in fourth, at 15 percent, behind Warren and Buttigieg.

Other than Yang, the top polling candidates in the Nevada survey will all face each other in a debate Tuesday night in Iowa. It is the final debate before the first-in-the-nation Iowa caucuses on Feb. 3.

The Suffolk University–USA Today poll surveyed 500 likely Democratic caucusgoers. It was conducted Jan. 8–11 and has a margin of error of plus or minus 4.4 percentage points.