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

Sens. Kamala HarrisKamala HarrisTrump plays video of Biden, Harris talking about fracking at Pennsylvania rally Overnight Defense: US, Russia closer on nuclear treaty extension after Moscow accepts warhead freeze | Khashoggi's fiancee sues Saudi crown prince | Biden nets hundreds more national security endorsements Democrats make gains in Georgia Senate races: poll MORE (Calif.) and Elizabeth WarrenElizabeth WarrenJustice Department charges Google with illegally maintaining search monopoly Overnight Health Care: Trump takes criticism of Fauci to a new level | GOP Health Committee chairman defends Fauci | Birx confronted Pence about Atlas Senate Democrats call for ramped up Capitol coronavirus testing MORE (Mass.) were the standouts from the first Democratic presidential debates, while confidence in former Vice President Joe BidenJoe BidenBiden holds massive cash advantage over Trump ahead of Election Day Tax records show Trump maintains a Chinese bank account: NYT Trump plays video of Biden, Harris talking about fracking at Pennsylvania rally MORE’s ability to defeat President TrumpDonald John TrumpBiden holds massive cash advantage over Trump ahead of Election Day Tax records show Trump maintains a Chinese bank account: NYT Trump plays video of Biden, Harris talking about fracking at Pennsylvania rally 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 SandersOcasio-Cortez rolls out Twitch channel to urge voting Calls grow for Democrats to ramp up spending in Texas The Hill's Morning Report - Sponsored by Goldman Sachs - Tipping point week for Trump, Biden, Congress, voters 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 BookerDurbin signals he isn't interested in chairing Judiciary Committee Booker 'outs' Cruz as vegan; Cruz jokingly decries 'scurrilous attack' Why Latinos should oppose Barrett confirmation 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.