Hillary Clinton leads Donald Trump by 10 percentage points nationally, according to a Quinnipiac University survey released Thursday.

The poll found 51 percent of likely voters in the U.S. support Clinton while 41 percent said they support Trump.

In a four-way race, Clinton leads Trump 45 percent to 38 percent while 10 percent support Libertarian Gary Johnson and 4 percent back Green Party candidate Jill Stein.

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Clinton’s expansive lead is due to support from women and non-white voters, Quinnipiac said. Trump, meanwhile, leads among men and white voters.

The poll found that 32 percent of Clinton’s supporters actually back her while 47 percent of them are voting to oppose Trump. On the other hand, a quarter of Trump’s supporters actually support him compared to nearly two-thirds who are voting for him mainly to oppose Clinton.

Both candidates, according to the poll have negative favorability ratings -- Clinton’s favorable/unfavorable rating is 41 percent/53 percent, while Trump’s is 33 percent favorable / 61 percent unfavorable. Thirty-seven percent of likely voters said they’d consider a third-party candidate.

But two-thirds of voters said Clinton is qualified to serve as president, the poll found, whereas 58 percent said Trump is not qualified.

Three-quarters of voters said that Trump should release his tax returns, including 62 percent of Republicans. Nearly 60 percent of voters said “the way Donald Trump talks appeals to bigotry.”

A Suffolk University poll released Thursday found Clinton leads Trump by 7 percentage points in Michigan.

The Quinnipiac poll surveyed 1,498 voters between August 18 and 24 with a 2.5 percentage point margin of error.