On the heels of a survey showing the Vermont senator with a commanding lead in Iowa, a new poll out Sunday shows Sen. Bernie Sanders with a nine-point lead in early primary state New Hampshire.

According to the CNN poll conducted by the University of New Hampshire, Sanders captured the support of 25 percent of likely primary-goers, up four points since October.

Former Vice President Joe Biden came in second with 16 percent, a point up from October. The poll's margin of sampling error is plus or minus 4.3 percent.

Former South Bend, Indiana Mayor Pete Buttigieg came in third with 15 percent, and Sen. Elizabeth Warren followed with 12 percent.

Warren was the only one of the four to see her support drop. While Buttigieg gained five points since October, Warren fell six. She did remain primary-goers top second choice candidate, with 20 percent backing her as their number two.

Andrew Yang's five percent on the CNN poll also contributed to his qualifying for the next Democratic primary debate, which takes place Feb. 7 in New Hampshire.

Sanders also came out on top in an NBC News/Marist state poll released Sunday.

In that survey of likely Democratic primary voters in New Hampshire—which had a margin of error of plus or minus 4.5 percentage points—the Vermont senator had 22 percent and Buttigieg had 17 percent. Biden (15 percent) and Warren (13 percent) followed.

"Sanders' advantage is bolstered by his strong support among progressive Democrats and younger voters," said Lee Miringoff, the director of the Marist College Institute for Public Opinion.

"His supporters are also far more enthusiastic about his candidacy than backers of his closest rivals," he added.

A day before the New Hampshire polls, a new New York Times/Siena College poll released Saturday showed Sanders leading with the support of 25 percent of likely Iowa caucus voters, ahead of second place Buttigieg who got 18 percent

Speaking at a rally in Ames, Iowa Saturday—an event that also featured Rep. Alexandria Ocasio-Cortez (D-N.Y.) and filmmaker Michael Moore—Sanders said the polls are putting entrenched interets on edge.

The polls come shortly before Iowa's February 3 caucus and New Hampshire's February 11 primary.