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

Sens. Kamala HarrisKamala Devi HarrisBiden leads 2020 pack in congressional endorsements Harris on 2020 endorsement: 'I am not thinking about it right now' Panel: Is Kamala Harris a hypocrite for mulling a Joe Biden endorsement? MORE (Calif.) and Elizabeth WarrenElizabeth Ann WarrenWarren: Dershowitz presentation 'nonsensical,' 'could not follow it' On The Money: Stocks close with steep losses driven by coronavirus fears | Tax season could bring more refund confusion | Trump's new wins for farmers may not undo trade damage Overnight Energy: Sanders scores highest on green group's voter guide | Trump's latest wins for farmers may not undo trade damage | Amazon employees defy company to speak on climate change MORE (Mass.) were the standouts from the first Democratic presidential debates, while confidence in former Vice President Joe BidenJoe BidenWarren: Dershowitz presentation 'nonsensical,' 'could not follow it' Bolton told Barr he was concerned Trump did favors for autocrats: report Dershowitz: Bolton allegations would not constitute impeachable offense MORE’s ability to defeat President TrumpDonald John TrumpWarren: Dershowitz presentation 'nonsensical,' 'could not follow it' Bolton told Barr he was concerned Trump did favors for autocrats: report Dershowitz: Bolton allegations would not constitute impeachable offense 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 SandersGOP Iowa senator suggests Trump impeachment defense could hurt Biden at caucuses On The Money: Stocks close with steep losses driven by coronavirus fears | Tax season could bring more refund confusion | Trump's new wins for farmers may not undo trade damage Sanders launches first TV ads in Nevada 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 BookerSenate Dems to Pompeo: Comments about NPR reporter 'insulting and contemptuous' Black caucus in Nevada: 'Notion that Biden has all of black vote is not true' The Hill's 12:30 Report: House managers to begin opening arguments on day two 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.