Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.) has surged past fellow 2016 Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense 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.