Warren overtakes Biden in Iowa for first time: poll

Sen. Elizabeth WarrenElizabeth Ann WarrenEx-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Former Vermont Governor: Sanders 'will play dirty' Hill.TV's Krystal Ball rips Warren over feud with Sanders MORE (D-Mass.) led former Vice President Joe BidenJoe BidenLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Ex-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Parnas says he doesn't think that Joe Biden did anything wrong regarding Ukraine 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 SandersEx-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Former Vermont Governor: Sanders 'will play dirty' Hill.TV's Krystal Ball rips Warren over feud with Sanders MORE (I-Vt.) with 11 percent, South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegFormer insurance executive: 'Medicare for all' would eliminate jobs that are 'not needed' Buttigieg says he's proud to be a part of US system amid UK royal family drama Buttigieg asked about 'Mayo Pete' memes by New York Times ed board MORE with 9 percent and Sen. Kamala HarrisKamala Devi HarrisOvernight Energy: Schumer votes against USMCA, citing climate impact | Republicans offer details on their environmental proposals | Microsoft aims to be carbon negative by 2030 Here are the 10 senators who voted against Trump's North American trade deal Team Trump criticizes Sanders for vote against USMCA 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.