Harris, Warren are biggest debate winners, confidence in Biden drops: poll

Sens. Kamala HarrisKamala Devi HarrisCalifornia poll: Biden, Sanders lead Democratic field; Harris takes fifth Kamala Harris calls for new investigation into Kavanaugh allegations Poll: Biden holds five-point lead over Warren among New York Democrats MORE (Calif.) and Elizabeth WarrenElizabeth Ann WarrenSanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth Kamala Harris calls for new investigation into Kavanaugh allegations MORE (Mass.) were the standouts from the first Democratic presidential debates, while confidence in former Vice President Joe BidenJoe BidenSanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth Poll: Biden holds five-point lead over Warren among New York Democrats MORE’s ability to defeat President TrumpDonald John TrumpBusiness, ballots and battling opioids: Why the Universal Postal Union benefits the US Sanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth MORE fell sharply, according to a new poll.

The latest HuffPost-YouGov survey of Democrats found that 59 percent said that Warren did the best out of all the candidates on stage for the first night, followed by former Housing and Urban Development Secretary Julián Castro at 16 percent. No other candidates registered in the double digits on the first night.  

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On the second night of debate, Harris was the clear winner, with 59 percent of Democrats polled saying she outperformed the field, followed by Biden at 16 percent and Sen. Bernie SandersBernie SandersSanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth Kamala Harris calls for new investigation into Kavanaugh allegations MORE (I-Vt.) at 11 percent. 

When voters were asked whether their opinions of the candidates improved or worsened, Warren fared the best, posting a net improvement of 54 points. Harris improved by 49 points, followed by Castro at 37 and Sen. Cory BookerCory Anthony BookerOvernight Energy: Top presidential candidates to skip second climate forum | Group sues for info on 'attempts to politicize' NOAA | Trump allows use of oil reserve after Saudi attacks Poll: 33 percent of voters undecided on who won third Democratic debate Jon Bon Jovi: Booker would 'do an amazing job' as president MORE (N.J.) at 20.

Biden’s image worsened by 11 points in the survey.

In addition, the former vice president’s electability argument appears to have taken a hit, although he is still seen as having the best shot to defeat Trump. 

Fifty-seven percent of Democrats said they believe Biden is capable of defeating Trump, down from 70 percent in May.

Fifty-one percent said they believe Warren is capable of defeating Trump, up from 40 percent in the prior survey. Forty-nine percent said the same of Harris, a 10-point jump from May.

The HuffPost-YouGov survey of 1,000 Democrats was conducted between June 27 and June 29. The survey does not have a traditional margin of error.