Poll: Clinton leading Sanders by just 7 points
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Hillary ClintonHillary Diane Rodham ClintonStopping Robert Mueller to protect us all Hillary Clinton hits Trump, pulls out Russian hat during Yale speech Giuliani: Mueller plans to wrap up Trump obstruction probe by Sept. 1 MORE’s lead over Vermont Sen. Bernie SandersBernard (Bernie) SandersHarvard law professor: Impeachment could worsen political dysfunction, polarization Gun control debate shifts to hardening schools after Texas shooting Bernie Sanders: NRA to blame for lack of action on gun control 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 BidenJoseph (Joe) Robinette BidenBiden says 'enough is enough' after Santa Fe school shooting Zinke provided restricted site tours to friends: report Democrat wins Philadelphia-area state House seat for the first time in decades 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.