Some Democrats are hesitant to support former Vice President’s Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE’s presidential bid over his 2002 vote in favor of the invasion of Iraq, according to a Politico–Morning Consult poll released Wednesday.

Nearly 3 in 10 Democrats said in the survey that they were turned off by Biden's Iraq War vote while he was serving as a senator from Delaware. More than 40 percent of respondents between the ages of 18 and 29 said his record on the issue made them less likely to support him.

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Thirty-two percent of all respondents said the war vote makes no difference to them, compared to 21 percent who said it made them more likely to support Biden, according to the poll. Eighteen percent said they don’t know whether it would influence their choice or that they have no opinion.

Biden backed the resolution in 2002 giving then-President George W. Bush the authority to invade Iraq after the 9/11 attacks and praised Bush during a speech on the Senate floor.

“President Bush did not lash out precipitously at Iraq after 9/11. He did not snub the U.N. or our allies. He did not dismiss new inspection regimes. He did not ignore Congress,” Biden said in a floor speech at the time.

“At each pivotal moment, he has chosen a course of moderation and deliberation, and I believe he will continue to do so. At least, that is my fervent hope,” Biden said. “I wish he would turn down the rhetorical excess in some cases because I think it undercuts the decision he ends up making. But in each case in my view he has made the right, rational, calm, deliberate decision."

Biden later said that he regretted his vote, calling it a “mistake" in 2005.

“It was a mistake to assume the president would use the authority we gave him properly. ... We gave the president the authority to unite the world to isolate Saddam. And the fact of the matter is, we went too soon. We went without sufficient force, and we went without a plan,” Biden said on NBC’s "Meet the Press."

Other Democrats vying for the party’s nomination, however, have targeted Biden’s Iraq War vote.

Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.), who voted against the war, pointed to the 2002 vote as an example of Biden’s record on progressive issues.

"Joe voted for the war in Iraq. I led the effort against it. Joe voted for NAFTA, permanent normal trade relations — trade agreements with China. I led the effort against that. Joe voted for the deregulation of Wall Street. I voted against that," Biden said earlier this month on ABC’s “This Week.”

The Politico–Morning Consult poll surveyed 1,995 registered voters between May 10-12. It has a margin of error of 2 percentage points.