Former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE continues to lead in Iowa just before the first-in-the-nation caucuses, but Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) is closing the gap between himself and the front-runner, according to a Monmouth University poll released Wednesday.

The poll, conducted from Jan. 23-27, found Biden with 23 percent support among likely Democratic caucusgoers, roughly on par with a previous Monmouth survey from earlier this month that showed him at 24 percent in the Hawkeye State.

Sanders, however, is within the margin of error for first place, notching 21 percent in the latest poll — a 3-point gain since the early January survey.

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Former South Bend, Ind., Mayor 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 and Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.), meanwhile, are neck and neck, scoring 16 percent and 15 percent, respectively. Another contender, Sen. Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.), took 10 percent in the poll, marking the first time since launching her presidential bid last year that she has scored in double digits in Iowa.

The survey suggests that, just five days out from the Iowa caucuses, the presidential race in the state is wide open, with no candidate having a clear advantage heading into caucus day.

What’s more, 45 percent of likely caucusgoers surveyed expressed at least some degree of openness to supporting a candidate other than their current first choice at the caucuses. Another 47 percent said they were firmly decided on their candidate of choice.

That matters in the caucuses, where voters are charged with persuading their peers whose candidate of choice isn’t considered viable to back their preferred candidate instead.

In most Iowa precincts, candidates need to win at least 15 percent support to be considered viable. Caucusgoers whose candidates don’t meet that threshold will then have to realign and support a different candidate.

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Warren is the candidate most frequently cited as likely caucusgoers’ second choice, with 19 percent saying they would back the Massachusetts senator if not their No. 1 pick. Biden takes second place in that category, with 16 percent putting him in their No. 2 spot, while Buttigieg comes in third, with 13 percent.

Only 11 percent of respondents said Sanders was their second choice in the Democratic field.

The Monmouth University poll surveyed 1,345 registered Democrats and unaffiliated voters in Iowa from Jan. 23-27. It has a margin of error of 4.2 percentage points.