Monmouth poll: Buttigieg, Biden, Sanders and Warren in tight race for New Hampshire primary

Buttigieg receives 20% of support among likely New Hampshire voters, Biden with 19%, Sanders 18%, and Warren 15%, the poll's margin of error of roughly 5 points.

Polling in New Hampshire this cycle has been quite volatile. Although all recent high-quality polls in New Hampshire show the same four candidates near the top and in double digits, there has been significant variation in the order in which those candidates finish. A CBS News/YouGov poll released Sunday found Sanders and Biden ahead of Warren and Buttigieg, while a MassINC/WBUR poll last month put Buttigieg, Biden and Sanders at the top, with Warren a bit behind.

In the Monmouth poll, under the 10% mark, Minnesota Sen. Amy Klobuchar garners 6% support, Hawaii Rep. Tulsi Gabbard and businessman Tom Steyer both land at 4% and businessman Andrew Yang receives 3%. No other candidate is above 2% in the poll.

The qualification deadline for next week's CNN/Des Moines Register debate is Friday. Buttigieg, Biden, Sanders, Warren and Klobuchar have already qualified for the debate. Monmouth provided no other candidate with a qualifying poll.

Just a few weeks out from the primary, Buttigieg and Sanders both saw a significant increase in their polling in the Granite State, while Biden and Warren have lost support since September (down 6 percentage points and 12 percentage points respectively).

Similar to their overall support, Warren and Biden have lost significantly in favorability as well. In September, Warren had a +55 favorability rating among likely Democratic voters in New Hampshire (favorability minus unfavorability); that fell to +37 in the new poll. Biden went from +42 in September to +33 now.

Meanwhile, Sanders has gained (up 6 points in favorability and down 5 in unfavorable). Buttigieg remained stable since September in favorability (62%), but has ticked up slightly in those who have an unfavorable opinion of him (from 12% to 17%).

Klobuchar, Yang and Steyer all saw an increase in their favorability ratings in the poll. Almost half of likely registered voters in New Hampshire have a positive view of Klobuchar (48%), up 7 points since September. Yang's rating jumps up 22 points since Monmouth's last poll, with a decrease in his unfavorability and fewer people who don't know him. Steyer's rating is also up 9 points.

Almost two thirds of likely voters (63%) in New Hampshire think Iowa and New Hampshire have the right amount of influence on who wins the party nominations for president. Additionally, 63% think it makes little difference in whether the Democratic Party nominates the best candidate.

However, almost half (46%) say that it would be a good idea to allow one or two other states to hold their primary on the same day as New Hampshire, a big move from their current status as second state in the nation to hold a nominating contest.

The Monmouth University Poll was conducted by telephone from January 3 to 7, with 404 New Hampshire voters who are likely to vote in the Democratic presidential primary in February. The question results in this release have a margin of error of +/- 4.9 percentage points.