A new poll released Saturday reveals Massachusetts Sen. Elizabeth Warren for the first time leading the Democratic field of 2020 hopefuls in the critical caucus state of Iowa.

The poll, conducted by CNN with the Des Moines Register and Mediacom, shows Warren with 22 percent support among likely Democratic caucus-goers, a 2 percent lead over the former vice president Joe Biden, who has 20 percent. This falls within the 4-point margin of error for the poll.

Also in the poll, Sen. Bernie Sanders of Vermont has fallen to 11 percent, followed by South Bend, Indiana, Mayor Pete Buttigieg with 9 percent and Sen. Kamala Harris of California with 6 percent. Harris pivoted her focus to the critical first-in-the-nation caucus state this week. Her campaign manager, Juan Rodriguez, told reporters Thursday that Harris needs at least a third-place finish in Iowa to stay competitive in the primary, according to CNN.

The poll also shows Sens. Cory Booker of New Jersey and Amy Klobuchar of Minnesota each with 3 percent support, while Rep. Tulsi Gabbard of Hawaii, former Texas representative Beto O’Rourke, billionaire Tom Steyer, and tech entrepreneur Andrew Yang each polled at 2 percent. The rest of the candidates have garnered 1 percent support or less.

A series of recent polls have showed Warren picking up momentum following well-received debate performances and new policy proposals amping up the progressive senator’s popularity among Democrats.

Just this week, Warren unveiled a new plan for ending Washington corruption, which she rolled out with a speech to more than 20,000 people in New York City’s Washington Square Park.

While the new poll shows Warren leading in Iowa, her 2 percent lead is well within the 4 percent margin of error, but RealClearPolitics’ latest aggregate of polls shows Warren in a solid second-place standing nationwide on an upward trajectory.

The Des Moine Register/CNN/Mediacom poll surveyed 602 likely Democratic caucusgoers between Sept. 14-18.