It’s been a successful stretch for Sanders, who raked in $34.5 million in fundraising for the fourth quarter of 2019 — putting the Democratic primary contender near President Donald Trump’s fourth quarter total of $46 million. Two other polls this week also showed Sanders and Biden ahead, and other polls show Sanders in the top ranks in Iowa and New Hampshire.

Sanders' polling and fundraising have remained steady since he suffered a heart attack on Oct. 1. The 78-year-old senator continues to do well with younger voters, with the WBUR poll showing he has the support of 52 percent of Democratic voters under 30.

While Warren’s accusations of sexism against Sanders have sparked recent controversy in the race, the WBUR poll shows that Sanders has slightly more support from female voters than male voters. Biden, on the other hand, pulls in his strongest support from older voters, polling highest with voters over 60.

A Boston Globe-Suffolk University poll released Tuesday shows a less significant lead for Sanders at 16.4 percent. Biden placed second in the poll at 14.8 percent, a 2.6-point gain since November.

Sanders outperformed Clinton in the 2016 New Hampshire primary and later lost the Democratic nomination. Clinton won New Hampshire by only a few votes in the general election.

As the Democratic candidates focus on the battleground state for 2020, Trump campaign manager Brad Parscale said his operation is gearing up to focus on what he calls “the growth states.”

“The New Hampshires, New Mexicos, the Minnesotas, you know, Nevada,” Parscale said on "Fox & Friends" on Wednesday. “States we didn’t win in 2016 that I do think we can win in 2020.”

The WBUR poll of 426 likely voters was conducted Jan. 17-21 by landline and cellphone and has a margin of error of 4.8 percentage points.

