Former Vice President Joe BidenJoe BidenHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Trump finalizing executive order calling on police to use ‘force with compassion’ The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook MORE remains the top choice among Iowa Democrats, but his lead is slipping as two challengers build support in the crucial first-in-the-nation caucus state.

Biden is the first choice of nearly a quarter of Iowa Democratic caucus-goers, according to a gold-standard survey released Saturday night by the pollster Ann Selzer.

Selzer, who conducted the Iowa Poll for the Des Moines Register and CNN, found three contenders fighting for second place: Sen. Bernie SandersBernie SandersThe Hill’s 12:30 Report: Milley apologizes for church photo-op Harris grapples with defund the police movement amid veep talk Biden courts younger voters — who have been a weakness MORE (I-Vt.) clocks in at 16 percent support; Sen. Elizabeth WarrenElizabeth WarrenWarren, Democrats urge Trump to back down from veto threat over changing Confederate-named bases OVERNIGHT DEFENSE: Joint Chiefs chairman says he regrets participating in Trump photo-op | GOP senators back Joint Chiefs chairman who voiced regret over Trump photo-op | Senate panel approves 0B defense policy bill Trump on collision course with Congress over bases with Confederate names MORE (D-Mass.) won support from 15 percent of Iowa voters; and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegScaled-back Pride Month poses challenges for fundraising, outreach Biden hopes to pick VP by Aug. 1 It’s as if a Trump operative infiltrated the Democratic primary process MORE took 14 percent.

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Sen. Kamala HarrisKamala Devi HarrisRand Paul introduces bill to end no-knock warrants The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook McEnany says Juneteenth is a very ‘meaningful’ day to Trump MORE (D-Calif.) scored 7 percent of the likely caucus-goers. Former Rep. Beto O’RourkeBeto O’RourkeBiden will help close out Texas Democrats’ virtual convention: report O’Rourke on Texas reopening: ‘Dangerous, dumb and weak’ Parties gear up for battle over Texas state House MORE (D-Texas) and Sen. Amy KlobucharAmy KlobucharHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Democrats demand Republican leaders examine election challenges after Georgia voting chaos Harris grapples with defund the police movement amid veep talk MORE (D-Minn.) each earned support from 2 percent of those surveyed. Every other candidate in the crowded field scored at one percentage point or below.

“There is clearly a top tier, with Biden leading, and Sanders, Warren, and Buttigieg wrestling for second place,” Selzer told The Hill. “Kamala Harris is on the bubble.”

A little less than eight months before Iowa Democrats hold their caucuses, the absolute levels of support each candidate wins is less important than the trajectory their numbers show. Those trajectories are positive for Warren and Buttigieg — and distinctly negative for Biden and Sanders.

The survey, conducted June 2-5 among 433 likely Iowa Democratic caucus-goers, is the third time Selzer has tested the field. In December, she showed Biden leading with 32 percent, ahead of Sanders’s 19 percent. In March, Biden led the field at 27 percent, while Sanders took 25 percent.

Today, Biden’s support has slipped by a third from that initial survey. Sanders, whose 2016 campaign makes him among the best-known contenders in the field, has seen his support drop by more than a third.

Biden’s supporters are less enthusiastic about his candidacy than supporters of every other candidate, Selzer said, a worrying sign for a front-runner who has suddenly appeared vulnerable.

By contrast, Warren won 8 percent support in the first poll and 9 percent in the second poll. Buttigieg wasn’t even tested in the December survey, and by March only 1 percent of Iowa Democrats picked him as their favorite.

“The Warren campaign operation seems to be helping her gain traction,” said Jeff Link, a Democratic strategist in Iowa who is unaligned in the 2020 presidential race. “This is a very encouraging poll for Mayor Pete.”

O’Rourke has also taken a precipitous slide in recent months. In Selzer’s December survey, 11 percent of Iowa Democrats backed the former Texas congressman. That number fell to 5 percent by March, and to just 2 percent Saturday.

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The poll measures the strength of the field at a moment when many Iowa Democrats are only beginning to tune in. Nineteen candidates will travel to Cedar Rapids on Sunday to stump before the Iowa Democratic Party’s annual Hall of Fame dinner, the first real Iowa cattle call of the race for the 2020 nomination. Every significant candidate, except for Biden, will address party activists.

The Iowa Poll carried a margin of error of plus or minus 4.7 percentage points for those planning to attend in-person and 7.6 points for those who plan to attend virtually.