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Poll: Sanders takes lead in Iowa less than a month before vote

Sen. Bernie SandersBernie SandersWyden: Funding infrastructure with gas tax hike a 'big mistake' The Hill's Morning Report - Presented by Facebook - Biden, Congress drawn into pipeline cyberattack, violence in Israel The Memo: Outrage rises among liberals over Israel MORE (I-Vt.) has taken the lead in Iowa, according to a Des Moines Register/CNN poll released on Friday that shows the Vermont senator jumping past his top rivals after a third-place finish in the same survey in November.

The poll, widely considered the most authoritative in Iowa, shows Sanders with the support of 20 percent of likely Democratic caucusgoers. He's trailed closely by another progressive, Sen. Elizabeth WarrenElizabeth WarrenThe Hill's Morning Report - Presented by Facebook - Biden, Congress drawn into pipeline cyberattack, violence in Israel The Memo: Outrage rises among liberals over Israel The Hill's Morning Report - Presented by Facebook - Infrastructure, Cheney ouster on deck as Congress returns MORE (D-Mass.), who registered 17 percent in the survey.

Former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegBefore building sustainably, let's define 'sustainability' Buttigieg labels infrastructure a national security issue 'Funky Academic:' Public has been 'groomed to measure progress by firsts' MORE and former Vice President Joe BidenJoe BidenKinzinger, Gaetz get in back-and-forth on Twitter over Cheney vote Cheney in defiant floor speech: Trump on 'crusade to undermine our democracy' US officials testify on domestic terrorism in wake of Capitol attack MORE round out the top four, notching 16 percent and 15 percent support, respectively. 

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Still, Sanders’s lead in Iowa is narrow – within the poll’s 3.7 percent margin of error – suggesting that the race in the Hawkeye State remains wide open with less than a month to go before the first-in-the-nation caucuses.

The Des Moines Register poll shows that Iowa remains a four-person race. No other candidate managed to register in double digits. Sen. Amy KlobucharAmy KlobucharSenate panel deadlocks in vote on sweeping elections bill Senate descends into hours-long fight over elections bill Senate poised for all-day brawl over sweeping elections bill MORE (D-Minn.), an underdog who’s banking on a strong finish in Iowa to lend momentum to her campaign, notched 6 percent in the poll, while former tech executive Andrew YangAndrew YangOcasio-Cortez hits Yang over scrapped Eid event: 'Utterly shameful' Yang's tweet in support of Israel draws praise from conservatives New York mayoral candidates go viral for vastly underestimating housing costs MORE finished just below her, with 5 percent support.

Sen. Cory BookerCory BookerIn honor of Mother's Day, lawmakers should pass the Momnibus Act Bush testifies before Congress about racist treatment Black birthing people face during childbirth, pregnancy Tim Scott sparks buzz in crowded field of White House hopefuls MORE (D-N.J.) also failed to gain ground in the poll, coming in with just 3 percent support. That’s unchanged from the Register’s November poll.

The poll is welcome news for Sanders, who rose 5 points since the last Des Moines Register poll was released in November. That survey showed Buttigieg surging to the front of the pack with 25 percent support.

But Buttigieg’s political fortunes in the state appear to be reversing. He’s faced criticism in recent weeks for his fundraising practices, especially from Warren, who pointedly attacked the former Indiana mayor at last month’s Democratic presidential debate for holding a fundraiser at a so-called “wine cave” in California.

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The number of likely caucusgoers who say their minds are made up on who they will support in the Feb. 3 caucuses has risen, as well. Forty percent of respondents said they are sure of their choice. But that still leaves 45 percent who say they could still change their minds, and 13 percent who have not yet picked a favorite candidate, according to the poll.

Things could still change in Iowa in the weeks leading up to the caucuses. The five senators running for the Democratic nomination are facing President TrumpDonald TrumpKinzinger, Gaetz get in back-and-forth on Twitter over Cheney vote READ: Liz Cheney's speech on the House floor Cheney in defiant floor speech: Trump on 'crusade to undermine our democracy' MORE’s impending impeachment trial, which is expected to begin next week. That means that they will be stuck in Washington, while candidates like Buttigieg and Biden will be free to campaign in the Hawkeye State.

At the same time, the Iowa caucuses are famously difficult to forecast, because unlike primaries, they involve showing up to a specific location at a specific time – and in the dead of winter – while caucusgoers work to persuade fellow voters to support their preferred candidate.

Because caucusgoers can change their minds on caucus night, second-choice preferences are considered crucial. Warren and Buttigieg were the two candidates most frequently mentioned as caucusgoers’ second choices, picked by 16 percent and 15 percent, respectively.

Twelve percent said that Biden is their second choice in the state, while just as many said Sanders is their No. 2 pick, according to the poll.

The Des Moines Register/CNN poll surveyed 701 likely Democratic caucusgoers in Iowa from Jan. 2-8. It has a margin of error of plus or minus 3.7 percentage points.

-- Updated at 6:38 p.m.