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Warren overtakes Biden in Iowa for first time: poll

Sen. Elizabeth WarrenElizabeth WarrenHillicon Valley: High alert as new QAnon date approaches Thursday | Biden signals another reversal from Trump with national security guidance | Parler files a new case Senators question Bezos, Amazon about cameras placed in delivery vans Democrats worry Senate will be graveyard for Biden agenda MORE (D-Mass.) led former Vice President Joe BidenJoe BidenThe West needs a more collaborative approach to Taiwan Abbott's medical advisers were not all consulted before he lifted Texas mask mandate House approves George Floyd Justice in Policing Act MORE in Iowa for the first time in a presidential primary poll released Saturday. 

The Des Moines Register/CNN/Mediacom poll of likely Democratic caucusgoers in Iowa found that 22 percent support Warren for president, while 20 percent said Biden was their top choice.

The two top candidates were within the poll's margin of error, but it represents the first time Biden hasn't been at the top of the field in the crucial first-in-the-nation caucus state. 

When considering second choices, Warren's lead over Biden expands, with a total of 42 percent of likely Democratic voters calling her their first or second choice. Biden was one of the top two choices for 30 percent of likely Democratic voters.

In the Iowa caucus, a voter’s first choice is viable only if they have at least 15 percent of the vote. If they don't, the voter can switch to their second choice.

The top two candidates were trailed by Sen. Bernie SandersBernie SandersOn The Money: Democrats deals to bolster support for relief bill | Biden tries to keep Democrats together | Retailers fear a return of the mask wars Democrats cut deals to bolster support for relief bill Hillicon Valley: High alert as new QAnon date approaches Thursday | Biden signals another reversal from Trump with national security guidance | Parler files a new case MORE (I-Vt.) with 11 percent, South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegHere's who Biden is now considering for budget chief Biden's COVID, border policies prove he's serious about neither Harris pushes for support for cities in coronavirus relief package MORE with 9 percent and Sen. Kamala HarrisKamala HarrisMichelle Obama says 'everyone was concerned' about potential violence at Biden inauguration Ella Emhoff, inauguration designer join forces on knitwear collaboration Who is the Senate parliamentarian and why is she important? MORE (D-Calif.) with 6 percent. 

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Biden was ahead of Warren in the Des Moines Register's three past polls of the 2020 cycle, but Warren has seen a steady increase. 

In December, she had the support of 8 percent of respondents, while she had the support of 9 percent in March. In June, 15 percent of respondents supported her, although the paper noted that the June poll had a slightly different methodology than the others. The Massachusetts senator has also seen increased momentum in recent months on a national level.

J. Ann Selzer, president of Selzer & Co., which conducted the poll, told the Des Moines Register that this was the race's “first major shakeup.” 

“It’s the first time we’ve had someone other than Joe Biden at the top of the leader board,” Selzer said. 

Researchers surveyed 602 likely Democratic caucusgoers between Sept. 14 and Sept. 18. The poll's margin of error is 4 percentage points.

Biden has been the front-runner of the 2020 Democratic presidential race in most major polls, although Warren's campaign has seen momentum in recent months. 

They are among more than a dozen people running for the party's nomination.