Sen. Bernie Sanders Bernard (Bernie) SandersSenate Dems seek to turn tables on GOP in climate change fight Bernie Sanders Town Hall finishes third in cable news race, draws 1.4 million viewers Woman to undecided Biden: 'Just say yes' to 2020 bid MORE (I-Vt.) has surged past fellow 2016 Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails County GOP in Minnesota shares image comparing Sanders to Hitler Holder: 'Time to make the Electoral College a vestige of the past' MORE in Iowa, according to a new poll.

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Sanders now leads Clinton, 41 percent to 40 percent, among likely Democratic caucus-goers in the Hawkeye State, Quinnipiac University pollsters found.

In July, Clinton was at 52 percent among Iowa’s likely Democratic caucus-goers versus 33 percent for Sanders.

“[Sanders] is the candidate of the Democratic left, against his own party’s bosses and their prized presidential candidate, Hillary Clinton,” said Peter A. Brown, assistant director of the Quinnipiac University Poll.

“Sanders has seized the momentum by offering a message more in line with disproportionately liberal primary and caucus voters,” he added.

The new sampling also finds an enthusiasm boost among Iowa’s likely Democratic caucus-goers for Vice President Biden as he weighs up a third Oval Office bid.

Pollsters found 12 percent support for Biden in the Hawkeye State, up 7 percent from Quinnipiac’s sampling in July.

Former Maryland Gov. Martin O’Malley garnered 3 percent.

Quinnipiac University surveyed 832 likely Iowa Democratic caucus-goers from Aug. 27 to Sept. 8 for its latest sampling. It has a 3.4 percent margin of error.