Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s lead over Vermont Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I) is now just 7 points among Democratic primary voters, according to a new poll.

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The NBC News/Wall Street Journal poll released Sunday morning found Clinton with 42 percent support nationally, compared to Sanders’s 35 percent.

If Vice President Joe Biden Joe BidenJoe Biden looks to expand election battleground into Trump country Trump puts Supreme Court fight at center of Ohio rally Special counsel investigating DeVos for potential Hatch Act violation: report MORE does not run, pollsters found, Clinton’s lead over Sanders rises to 15 points. Biden had 17 percent support in the survey.

Clinton held a 34-point lead over Sanders in July, and a 60-point lead in June.

On the Republican side, Donald Trump and Ben Carson are atop the GOP field with 21 percent and 20 percent support from Republican primary voters, respectively.

Florida Sen. Marco Rubio is tied for third place with Carly Fiorina, with 11 percent apiece.

The poll, conducted Sept. 20-24, has a 6.1 percent margin of error for Democratic primary voters. Its margin of error for Republican voters is 6.5 percent.