Biden slumps, Buttigieg soars: 6 takeaways from benchmark Iowa poll

Just hours before presidential candidates will pitch themselves to Iowa Democratic activists in the first-in-the-nation caucus state, a new poll of likely caucusgoers is rattling the race — and hinting that a formidable front-runner is not as invincible as he might appear.

The Iowa Poll, conducted by veteran pollster Ann Selzer for The Des Moines Register and CNN, found former Vice President Joe BidenJoe BidenPelosi sets Thursday vote on bipartisan infrastructure bill Pressure grows to cut diplomatic red tape for Afghans left behind President Biden is making the world a more dangerous place MORE leading the Democratic field with 24 percent of the vote.

The race for second place is a statistical tie between Sen. Bernie SandersBernie Sanders Texas House Republican tests positive for coronavirus in latest breakthrough case In defense of share buybacks Progressives seething over Biden's migrant policies MORE (I-Vt.) at 16 percent, Sen. Elizabeth WarrenElizabeth WarrenIn defense of share buybacks Democrats urge Biden to go all in with agenda in limbo In Washington, the road almost never taken MORE (D-Mass.) at 15 percent and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegDOJ sues to block JetBlue-American Airlines partnership On The Money — Presented by Wells Fargo — Pelosi plows full speed ahead on jam-packed agenda Blumenthal calls on Buttigieg to investigate American Airlines-JetBlue partnership MORE at 14 percent.

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Sen. Kamala HarrisKamala HarrisBiden, Harris push big lie about Border Patrol Two 'View' hosts test positive for coronavirus ahead of Harris interview Rep. Karen Bass to run for mayor of Los Angeles: report MORE (D-Calif.) is the only other candidate who registers significant support. She clocked in at 7 percent of the vote. Six percent of voters said they were not sure who they would choose on caucus night.

Eight months before voters head to their caucus sites, though, the poll shows movement within a Democratic primary that is still wide open.

Here are six takeaways from the Iowa Poll.

Biden's support is shaky

In December, months before he even entered the race, nearly a third of Iowa voters said they backed Biden. Today, about six weeks after he announced he would run, Biden's support has fallen by a third.

Biden's declining support came even before this week's controversy over his flip-flop on the Hyde Amendment, which came after Selzer began fielding her poll.

In December, 82 percent of Iowa Democratic voters said they saw Biden favorably; this month, that number is down to 72 percent of Democratic voters, a 10-point drop. His unfavorable ratings are up 9 points.

And Biden's backers are less enthusiastic about their chosen candidate than supporters of other candidates. Just 29 percent of Biden's supporters say they are extremely enthusiastic about backing the former vice president. An average of 43 percent of Sanders, Warren and Buttigieg supporters say they are extremely enthusiastic about backing their chosen candidate.

Sanders has a ceiling

Three years ago, Sanders came within a handful of votes of achieving a stunning upset over front-running former Secretary of State Hillary ClintonHillary Diane Rodham ClintonDemocrats worry negative images are defining White House Heller won't say if Biden won election Whitmer trailing GOP challenger by 6 points in Michigan governor race: poll MORE. Today, almost every Iowa Democrat has an opinion of Sanders; only 5 percent of likely caucusgoers say they do not know enough about him to have formed an opinion, a lower number than everyone but Biden.

But Sanders also has one of the highest unfavorable numbers among Democratic candidates; a quarter of state Democrats say they view him negatively, about the same percentage as those who see Biden unfavorably.

The dichotomy between Sanders's high name recognition and his relatively low poll numbers suggest Sanders fans from 2016 are looking elsewhere this year — and that the 77-year-old self-avowed democratic socialist has a ceiling through which he cannot break.

As Warren, Buttigieg, Harris and the others introduce themselves to voters and earn more support, they are likely to pull from a population that backed Sanders over Clinton in 2016.

The high unfavorable ratings that Sanders and Biden suffer aren't the worst in the field. More than 4 in 10 Iowa Democrats see New York City Mayor Bill de BlasioBill de BlasioFederal appeals court blocks NYC teacher vaccine mandate Meghan, Prince Harry visit One World Trade Center Google to purchase Manhattan building for .1 billion MORE unfavorably.

Warren is on a growth trajectory

Selzer is considered one of the most skilled pollsters when it comes to surveying Iowa's electorate. What makes her especially effective is that her surveys consistently illustrate who's on the move, up or down.

And though it is eight months before the caucuses, Warren is the candidate on the move. She has a higher net favorable rating than any other candidate in the field; 71 percent see her favorably, while just 17 percent see her unfavorably. That's a better ratio than Biden, Sanders and Buttigieg.

An equal number of Democratic voters, 61 percent, say they are actively considering or backing Warren and Biden, the highest rates in the field. That's 5 points higher than those who say Sanders is on their ticket and 9 points higher than both Buttigieg and Harris.

Warren has been more aggressive in laying out detailed policy proposals than any other candidate. She has hired more staffers in Iowa than any other candidate, and she has spent more time in Iowa — more than two weeks — than any other front-runner.

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In terms of sheer growth, no one has improved more than Buttigieg, who wasn't even included in the December survey. Buttigieg scored just 1 percent support in the March survey, fielded about a week before his first CNN town hall, where he captured the Democratic electorate's attention and vaulted from also-ran to top contender.

The Beto bust?

No one is in a deeper slump than former Rep. Beto O'RourkeBeto O'RourkeAnti-Trump Republicans on the line in 2022 too Matthew McConaughey on potential political run: 'I'm measuring it' Anti-Greg Abbott TV ad pulled minutes before college football game: Lincoln Project MORE (D-Texas). In December, a month after O'Rourke narrowly lost a spirited challenge to Sen. Ted CruzRafael (Ted) Edward CruzFBI investigating alleged assault on Fort Bliss soldier at Afghan refugee camp The Memo: Biden's immigration problems reach crescendo in Del Rio Matthew McConaughey on potential political run: 'I'm measuring it' MORE (R), 11 percent of Iowa Democrats said he was their first choice, while another 12 percent said he would be their second choice.

In this month's poll, only 2 percent of Iowa Democrats say Beto is their first choice, an 80 percent drop. Just 4 percent say he is their second choice.

The number of Iowa Democrats who say they view him unfavorably stands at 21 percent, almost double the number who said they saw him unfavorably back in December, while his favorable rating — 54 percent — is up only a single point. O'Rourke has held 52 events over 17 days, according to a tracker maintained by The Des Moines Register, but all that hard work isn't paying off.

Sens. Cory BookerCory BookerLawmakers gear up for spending bill, infrastructure votes Booker: End of police reform negotiations a 'frustrating experience' Sunday shows - All eyes on spending votes MORE (D-N.J.) and Amy KlobucharAmy KlobucharHillicon Valley — Presented by Xerox — Officials want action on cyberattacks Senate panel advances antitrust bill that eyes Google, Facebook This week: Democrats face mounting headaches MORE (D-Minn.) haven't gained any traction either. In Selzer's March poll, Booker and Klobuchar each claimed 3 percent of the vote; this month, Klobuchar is at 2 percent and Booker is at 1 percent, tied with the likes of former Rep. John DelaneyJohn DelaneyDirect air capture is a crucial bipartisan climate policy Lobbying world Coronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis MORE (D-Md.), Washington Gov. Jay InsleeJay Robert Inslee Washington state extends eviction protections through end of October Washington governor to Idaho officials: Stop 'clogging up my hospitals' Seattle area to require COVID-19 vaccine to enter indoor venues MORE (D) and tech entrepreneur Andrew YangAndrew YangYang's new party will be called 'The Forward Party' Andrew Yang planning to launch third party: report Poll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary MORE (D).

The best news for Booker: He's the second choice candidate for 6 percent of Iowa Democrats, a level of support that puts him in the conversation.

A tough field to poll

What's harder than keeping an Iowa voter on the phone while a pollster reads a list of all two dozen candidates running for the Democratic primary nomination? How about accounting for the two different kinds of elections Democrats will run next February?

The Iowa Democratic Party for the first time plans to hold what it is calling virtual caucuses — events in which voters who can't attend their polling places in person on February 3 can still make their preferences known.

Party rules say those who participate in virtual caucuses will be given the power to decide 10 percent of the delegates allocated during the caucuses, regardless of how many people show up in person or by phone. About 28 percent of likely Democratic caucusgoers said they would participate in the virtual caucus, making their votes worth about a third of those who actually show up in person.

That has forced Selzer to ask Iowa Democrats not just who they plan to support but how they plan to participate — and to weight support accordingly.

"Those who say they are likely to choose the virtual option are younger, more moderate, and more likely to be currently registered as 'no party,' which of course they must change to participate in the Democratic Party caucuses. They are also less committed to caucusing than those who say they intend to show up on caucus night," Selzer wrote in an explanation of her methodology.

Biden's support is higher among those who plan to caucus virtually, 33 percent, than those who plan to caucus in person, 23 percent. Buttigieg and Sanders fans disproportionately plan to show up in person. Warren's supporters are about evenly split, while Harris backers are more likely to say they will caucus virtually.

The new virtual caucus, meant to allow more voters to participate in the process, is likely to expand the universe of those who get to make their voices heard — and it's also going to make the process of measuring those voters all the more difficult.

Iowa Poll has clout

The Iowa Poll will be the lead story in tomorrow's Des Moines Register. It is already playing across CNN, the poll's other top sponsor. And it comes just as Iowa Democratic activists head to Cedar Rapids for the state party's annual Hall of Fame dinner, where 19 out of 24 presidential hopefuls will speak.

Selzer's poll will be the talk of the afternoon — so many candidates are speaking that the state party will kick off the event at 2 p.m. Central time. And it won't go unnoticed among state Democrats that the front-runner Biden is the only top contender who won't show up to woo the activist class.