A stunning new poll has Sen. Bernie SandersBernard (Bernie) SandersSanders: Trump setting 'terrible example' for our children Gabbard considering 2020 run: report Sanders, Harris set to criss-cross Iowa MORE (I-Vt.) beating presumptive Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonO'Rourke's rise raises hopes for Texas Dems down ballot Gabbard considering 2020 run: report Claiming 'spousal privilege' to stonewall Congress MORE in New Hampshire.

Sanders has eclipsed Clinton by a 44 to 37 percent margin, according to a new Franklin Pierce University/Boston Herald poll that was first reported by the Boston newspaper Tuesday evening.

The previous FPU/Herald poll taken in March had Sanders trailing Clinton 44 to 8.

Today's poll is the first to show Sanders, whose liberal policies are popular with the Democratic base, ahead of Clinton in New Hampshire.

And it comes as reports surfaced that Clinton will turn over her private email server that she used while leading the State Department to Justice Department officials.

Meanwhile, Vice President Joe BidenJoseph (Joe) Robinette BidenBiden: American values being 'shredded' under Trump Election Countdown: Small-donor donations explode | Russian woman charged with midterm interference | Takeaways from North Dakota Senate debate | O'Rourke gives 'definitive no' to 2020 run | Dems hope Latino voters turn Arizona blue Clinton aide: Chances 'highly unlikely' but 'not zero' Hillary will run for president again MORE garnered 9 percent, with the other remaining candidates hovering at around 1 percent, according to the poll.

Pollsters telephoned 442 likely Democratic voters in New Hampshire between Aug. 7 and Aug. 10. The poll has a margin of error of plus or minus 4.7 percentage points.

Clinton maintains a dominant lead in other polls. During her failed bid for presidency in 2008, she surged to narrowly win the New Hampshire primary after losing to then-Sen. Barack ObamaBarack Hussein ObamaSanders, Harris set to criss-cross Iowa Republicans bail on Coffman to invest in Miami seat Five takeaways from the first North Dakota Senate debate MORE in the Iowa caucuses.