Poll: Clinton holds 3-point lead over Trump nationally
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Hillary ClintonHillary Diane Rodham ClintonBiden faces do-or-die primary in South Carolina President Trump's assault on checks and balances: Five acts in four weeks Schiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again' MORE holds a 3-point lead over Donald Trump nationally, according to a new McClatchy-Marist poll released Wednesday.

Clinton has 42 percent support with Trump at 39 percent in a head-to-head matchup — the first time this poll had shown Clinton below 50 percent in the last year.

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Independents are divided on their candidate of choice, with 36 percent supporting Clinton and 33 percent supporting Trump. Another 23 percent of independents are undecided on whom they will support.

In a matchup including Libertarian Party nominee Gary JohnsonGary Earl JohnsonWeld bets on New Hampshire to fuel long shot bid against Trump The 'Green' new deal that Tom Perez needs to make The Trump strategy: Dare the Democrats to win MORE and the Green Party's Jill Stein, Clinton has a slightly larger lead. She has 40 percent in the four-way matchup, to Trump's 35 percent. Johnson has 10 percent support and Stein has 5 percent in the matchup.

Trump is viewed unfavorably by 64 percent of respondents, and Clinton is viewed unfavorably by 60 percent, the poll found.

The presumptive Democratic nominee has the support of 57 percent of voters who backed rival Bernie SandersBernie SandersAdvisor: Sanders could beat Trump in Texas Bloomberg rips Sanders over Castro comments Liberal author Matt Stoller: Iowa caucus screw-up was 'Boeing 737 Max of the Democratic Party' MORE, who endorsed her Tuesday. Trump has the support of 60 percent of Republicans who supported other candidates during the primary contests.

Clinton leads Trump among African-Americans, 81 to 6 percent; Latinos, 52 to 26 percent; and women, 51 to 33 percent. She also leads the presumptive GOP nominee among college graduates, those younger than 30 and those who make less than $45,000 a year.

Trump leads among whites, 49 to 34 percent, and men, 47 to 33 percent. He also has an advantage among non-college graduates and those ages 60 and older.

The poll also found that 48 percent of those supporting Clinton were motivated by their opposition toward Trump, and 56 percent of Trump supporters are backing him as an anti-Clinton vote.

The poll was conducted among 1,249 from July 5 to 9. The margin of error is 2.8 percentage points.

According to the RealClearPolitics average of polls, Clinton leads Trump by 4.3 points, 45 to 40.7 percent.