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

Sens. Kamala HarrisKamala Devi HarrisOutsider candidates outpoll insider candidates Poll: Buttigieg leads Democratic field in Iowa Press: Another billionaire need not apply MORE (Calif.) and Elizabeth WarrenElizabeth Ann WarrenDemocrats worry they don't have right candidate to beat Trump Overnight Energy: BLM staff face choice of relocation or resignation as agency moves | Trump says he's 'very much into climate' | EPA rule would expand limits on scientific studies Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment MORE (Mass.) were the standouts from the first Democratic presidential debates, while confidence in former Vice President Joe BidenJoe BidenDemocrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report Giuliani pens op-ed slamming 'unprecedented' impeachment inquiry MORE’s ability to defeat President TrumpDonald John TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report 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 SandersDemocrats worry they don't have right candidate to beat Trump Overnight Health Care: Top health official defends contract payments to Trump allies | Vaping advocates confident Trump will turn from flavor ban | Sanders gets endorsement from nurses union Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment 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 BookerOutsider candidates outpoll insider candidates The Hill's Campaign Report: Bloomberg looks to upend Democratic race Poll: Biden support hits record low of 26 percent 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.