Hillary ClintonHillary Diane Rodham ClintonBiden says Russia spreading misinformation ahead of 2022 elections Highest-ranking GOP assemblyman in WI against another audit of 2020 vote Women's March endorses Nina Turner in first-ever electoral endorsement MORE's campaign manager, Robby Mook, warns in a new video that the Democratic presidential nominee's supporters can't become complacent.

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"Donald TrumpDonald TrumpRealClearPolitics reporter says Freedom Caucus shows how much GOP changed under Trump Jake Ellzey defeats Trump-backed candidate in Texas House runoff DOJ declines to back Mo Brooks's defense against Swalwell's Capitol riot lawsuit MORE has been going around telling people not to listen to the polls and saying that he can still win this race," Mook said in a video posted by the Clinton campaign.

"Well, you know what? He's absolutely right."

Mook said in the video that Clinton has the "wind at her back."

But he said Florida, North Carolina and New Hampshire are called "battleground states" for a reason.

"They can go either way," he said, referencing a recent poll that showed the Democratic nominee trailing her Republican rival in Florida.

"We've seen polls tighten since the third debate and we expect things to get even closer before Election Day."

Mook then urged Clinton supporters to vote, warning of what could happen with low voter turnout.

"Make no mistake. With only 10 percent of votes cast, Donald Trump could win this election," Mook said.

"But if each one of us makes our voices heard, and we all vote, we're going to win."

Trump has claimed in the past that the polls are wrong, and he and his campaign have remained confident in the GOP nominee's chances of winning the White House.

Many polls, both nationally and in battleground states, have shown Clinton leading her Republican rival.