(Bloomberg) -- A new poll shows Bernie Sanders as the top pick for New Hampshire voters after support for the senator nearly doubled over the past month.

Sanders, who is from neighboring Vermont, jumped from fourth to first in a WBUR poll out Thursday.

He led the pack by double digits with 29%, up from 15% in December, followed by Pete Buttigieg with 17%, Joe Biden with 14% and Elizabeth Warren with 13%.

Aside from Sanders, all other candidates moved between 0 and 3 percentage points. The poll was conducted from January 17-21 and has a margin of error of 4.8 percentage points. WBUR is the Boston NPR affiliate.

Sanders led among voters under 45 with 37%. Among those voters, Buttigieg followed with 17%, Warren with 16% and Biden with 6%. Sanders also led among voters over the age of 45 with 24%, followed by Biden with 19%, Buttigieg with 16% and Warren with 11%.

This post is part of Campaign Update, our live coverage from the 2020 campaign trail.

--With assistance from Ryan Beckwith.

To contact the author of this story: Emma Kinery in Washington at ekinery@bloomberg.net

To contact the editor responsible for this story: Wendy Benjaminson at wbenjaminson@bloomberg.net, Magan Sherzai

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