Warren holds slim lead over Sanders in Iowa, Biden in fourth: poll

A new poll shows a tight race in Iowa, with Sen. Elizabeth WarrenElizabeth Ann WarrenFive takeaways from the Democratic debate As Buttigieg rises, Biden is still the target Leading Democrats largely pull punches at debate MORE (D-Mass.) leading the early voting state and former Vice President Joe BidenJoe BidenFive takeaways from the Democratic debate As Buttigieg rises, Biden is still the target Leading Democrats largely pull punches at debate MORE slipping to fourth.

The New York Times–Siena College poll released Friday showed Warren with 22 percent support from likely Democratic caucusgoers, Sen. Bernie SandersBernie SandersFive takeaways from the Democratic debate As Buttigieg rises, Biden is still the target Leading Democrats largely pull punches at debate MORE (I-Vt.) with 19 percent, South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegFive takeaways from the Democratic debate As Buttigieg rises, Biden is still the target Gabbard, Buttigieg battle over use of military in Mexico MORE (D) with 18 percent and Biden with 17 percent. All four fall close to the poll's margin of error of plus or minus 4.7 percentage points.

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No other candidate was near the top four, who were distantly trailed by Sen. Amy KlobucharAmy Jean KlobucharFive takeaways from the Democratic debate As Buttigieg rises, Biden is still the target Leading Democrats largely pull punches at debate MORE (D-Minn.) with 4 percent, Sen. Kamala HarrisKamala Devi HarrisFive takeaways from the Democratic debate Gabbard, Buttigieg battle over use of military in Mexico Leading Democrats largely pull punches at debate MORE (D-Calif.) with 3 percent and entrepreneur Andrew YangAndrew YangYang says white supremacist violence should be designated domestic terrorism Yang jokes first thing he'd say to Putin as president is 'Sorry I beat your guy' Steyer, Gabbard and Yang shut out of early minutes of Democratic debate MORE with 3 percent.

The survey is among a series of recent polls showing Warren leading the field in Iowa. A RealClearPolitics average of polls showed the senator ahead of the former vice president by an average of 5 percentage points Friday morning. 

Buttigieg's rise in the poll puts him much closer to the front-runners in Iowa than in national polls. He is in fourth place in the nationwide RealClearPolitics average of polls, trailing Sanders by 9 points.

Biden said in an MSNBC interview this week that he plans to do “very well” in Iowa and New Hampshire amid questions as to whether he can win the early caucus and primary states. 

“I plan on doing very well in both those," he said Tuesday. "I’ve been ahead in Iowa. I’ve been ahead in South Carolina. I’m ahead in all the national polls with the occasional one that pops up that’s different."

Researchers surveyed 439 likely Iowa Democratic caucusgoers from Oct. 25 to 30.

The Iowa caucuses are just more than three months away, taking place on Feb. 3.

More than a dozen people are vying for the 2020 Democratic presidential nomination.

Updated at 9:08 a.m.