Biden atop new poll as Warren makes gains, Sanders and Harris slip

Former Vice President Joe BidenJoe BidenUnited Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' Omar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' MORE remains the 2020 favorite among Democrats and Democratic-leaning independents, according to a new poll from ABC News and The Washington Post that shows Sen. Elizabeth WarrenElizabeth Ann WarrenUnited Auto Workers strike against GM poised to head into eighth day Omar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' Seven takeaways from a busy Democratic presidential campaign weekend in Iowa MORE (D-Mass.) gaining ground in her presidential bid and Sens. Bernie SandersBernie SandersOmar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' Seven takeaways from a busy Democratic presidential campaign weekend in Iowa Democrats go all out to court young voters for 2020 MORE (I-Vt.) Kamala HarrisKamala Devi HarrisSeven takeaways from a busy Democratic presidential campaign weekend in Iowa Fracking ban could have unintended consequence of boosting coal Poll: Voters back Medicare expansion, keeping private insurance MORE (D-Calif.) losing support.

The survey found that 27 percent of Democrats and Democratic-leaning independents favor Biden in the race for the Democratic presidential nomination.  

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Sanders came in second, with 19 percent of respondents saying they favor the Vermont senator. The percentage represents a decrease of 4 points from July. 

The new survey also found Warren gaining substantial ground. Seventeen percent said they'd support Warren as the Democratic presidential nominee, a 6-point increase in two months. 

Meanwhile, Harris earned support from 7 percent of respondents in the latest poll, representing a 4 percent drop from July.

South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegOmar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' Seven takeaways from a busy Democratic presidential campaign weekend in Iowa Democrats go all out to court young voters for 2020 MORE's support has remained steady at 4 percent in the poll, and former Rep. Beto O'RourkeBeto O'RourkeSeven takeaways from a busy Democratic presidential campaign weekend in Iowa FBI: Arson attacks directed at three Catholic churches in El Paso Toomey on gun reform: 'Beto O'Rourke is not helping' MORE (D-Texas) and businessman Andrew YangAndrew Yang2020 Democrats defend climate priorities in MSNBC forum Yang: 'Cancel culture' has become source of 'fear' for Americans Hundreds of thousands turn out in New York, other major cities for climate marches MORE earned support from 3 percent of respondents. 

The survey indicates that much could change in the coming months as candidates vie for the nomination. Just 43 percent of Democrats and Democratic-leaning independents said they are committed to their candidate if he or she remains in the race. Fifty percent said they'd be willing to go in another direction. 

Biden is also viewed by many as the candidate most able to beat President TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' MORE. Forty-two percent of respondents said he was the candidate was most likely to defeat Trump. But just 23 percent said Biden would be the "best president for the country." Meanwhile, 19 percent said Warren would make the best president for the country, while 16 percent said the same of Sanders. 

The ABC News-Washington Post poll was conducted between Sept. 2 and Sept. 5 among a national population of 1,003. The survey included a sample of 437 Democrats and Democratic-leaning independent adults. The margin of error for that sample is 5.5 percentage points.