Poll: Clinton leading Sanders by just 7 points
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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’s lead over Vermont 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) 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 BidenJoe BidenFacebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 Sanders hits back at Trump's attack on 'socialized medicine' Senate GOP to drop documentary series days before election hitting China, Democrats over coronavirus 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.