Democratic presidential hopeful Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE is gaining on rival Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE in New Hampshire just four days before the state's primary, according to a WBUR poll released Friday.

Sanders leads with 54 percent support, with Clinton trailing at 39 percent. The 15-point difference is closer than several recent polls in the Granite State, including one released Thursday that had Sanders ahead by 30 points.

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Sanders, who represents neighboring Vermont in the Senate, is heavily favored in New Hampshire.

The poll was conducted from Tuesday through Thursday and surveyed 393 likely Democratic primary voters. It has a margin of error of 4.9 percent.