(CNN) Vermont Sen. Bernie Sanders leads in New Hampshire, continuing to widen his top position, according to a new WBUR poll conducted by MassInc. out Thursday.

Sanders runs well ahead of the rest of the group, with 29% support among likely Democratic voters in the first-in-the-nation primary, followed by 17% support for former South Bend, Indiana, mayor Pete Buttigieg, 14% for former Vice President Joe Biden and 13% for Massachusetts Sen. Elizabeth Warren.

Minnesota Sen. Amy Klobuchar receives 6% support, with Hawaii Rep. Tulsi Gabbard and businessman Andrew Yang both at 5%, and businessman Tom Steyer at 2%. No other candidate receives above 1% support.

Sanders' rise from 15% in WBUR's December poll to 29% in the latest January edition is the biggest change in the last few months, in a state sandwiched between his home state and that of Warren.

A New Hampshire poll from Monmouth University taken earlier in January shows Sanders with 18% support, a gain in Monmouth's polling from 12% in September.

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