Poll: Clinton leads Trump by 48 points among millennials
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Hillary ClintonHillary Diane Rodham ClintonBon Jovi to campaign with Biden in Pennsylvania The Hill's Campaign Report: 2020 spending wars | Biden looks to clean up oil comments | Debate ratings are in Biden gets late boost with key union endorsement MORE is dominating Donald TrumpDonald John TrumpIvanka Trump, Jared Kusher's lawyer threatens to sue Lincoln Project over Times Square billboards Facebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 Sanders hits back at Trump's attack on 'socialized medicine' MORE among millennial voters, according to a new USA Today/Rock the Vote poll released Monday.

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Clinton, the Democratic presidential nominee, has 68 percent support among likely millennial voters, and Trump, the Republican nominee, is backed by only 20 percent, according to the survey.

Libertarian nominee Gary JohnsonGary Earl JohnsonPoll: Biden notches 7-point lead ahead of Trump in New Hampshire One down, three more debates to go The Memo: 'Trump fatigue' spells trouble for president MORE has the support of 8 percent of likely voters, and Green Party nominee Jill Stein is backed by 1 percent.

The poll finds millennials' enthusiasm for voting has gone down since March, when Sen. Bernie SandersBernie SandersSanders hits back at Trump's attack on 'socialized medicine' Trump's debate performance was too little, too late Final debate: War Admiral vs. Seabiscuit MORE (I-Vt.) was still running his primary campaign.

The main reason millennials give for backing Clinton is "to keep Donald Trump out of the White House." And the top reason Trump backers cite for their decision is to keep Clinton from winning.

A majority of millennial voters said the first debate made Trump seem less presidential, credible and trustworthy.

Only 47 percent of millennial women support Clinton, and 18 percent support Trump. Another combined 18 percent back either Johnson or Stein.

Among men, 65 percent back Clinton and only 6 percent combined support third-party candidates.

Millennial voters said jobs and the economy were the most important issues on which the next president should focus.

The survey was conducted by Ipsos from Oct. 11 to 13 among 1,020 adults ages 18 to 34. The margin of error is 3.5 percentage points.

A poll conducted earlier this month among millennial voters showed the Democratic nominee was up 25 points among millennials in 11 swing states.