Warren, Harris surge into tie with Biden in new Iowa poll

Sens. Elizabeth WarrenElizabeth Ann WarrenJulián Castro is behind in the polls, but he's finding a niche Gabbard arrives in Puerto Rico to 'show support' amid street protests Democratic strategist predicts most 2020 candidates will drop out in late fall MORE (D-Mass.) and Kamala HarrisKamala Devi HarrisWhat to expect when Mueller testifies: Not much Biden compares Trump to George Wallace CNN Democratic debate drawing finishes third in cable news ratings race MORE (D-Calif.) have surged into a virtual tie with former Vice President Joe BidenJoe BidenBiden compares Trump to George Wallace Sanders unveils plan to guarantee the 'right to a secure retirement' CNN Democratic debate drawing finishes third in cable news ratings race MORE in Iowa after last week’s debates, according to a new survey conducted for a Democratic group. 

The poll, conducted by Democratic pollster David Binder for the group Focus on Rural America, shows Warren leading the field with 20 percent of the vote, a statistical tie with Harris at 18 percent and Biden at 17 percent.

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Sen. Bernie SandersBernie SandersGabbard arrives in Puerto Rico to 'show support' amid street protests Democratic strategist predicts most 2020 candidates will drop out in late fall Sanders unveils plan to guarantee the 'right to a secure retirement' MORE (I-Vt.) is just off the podium at 12 percent, closely trailed by South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE at 10 percent. Sen. Amy KlobucharAmy Jean KlobucharDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage Protect American patients and innovation from a harmful MedTech Tax increase MORE (D-Minn.) clocks in at 4 percent, and Sen. Cory BookerCory Anthony BookerDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D-N.J.) scores 2 percent. Ten other candidates each notch 1 percent support in the Hawkeye State.

The poll shows Warren and Harris both doubling their support following strong performances in last week’s debate, while Biden and Sanders have slipped. In the group’s March poll, Biden led the field with 25 percent support, followed by Sanders at 17 percent.  

Klobuchar, Booker and former Rep. Beto O’Rourke (D-Texas) all saw their poll numbers slip. O’Rourke’s support slipped from 6 percent in the March poll to just 1 percent in the July survey, conducted entirely after the debates.

The debates certainly helped Harris and Warren: Voters who watched some or all of the two-night coverage said they were most likely to back one of the two senators, both of whom stood out onstage against their rivals.  

Harris has been steadily rising since she announced she would run in January.

Today, 82 percent of Iowa Democrats surveyed say they have a positive opinion about the California senator, up from 54 percent in a December poll and 73 percent in March. Warren is the most popular Democrat in the field, with 88 percent of respondents saying they have a positive opinion about the Massachusetts Democrat. 

Buttigieg’s image has also improved markedly, growing from a 44 percent positive image to an 80 percent positive image from March to July. 

On the other hand, Biden and Sanders have both seen opinions about them slide.

About three-quarters of Iowa Democrats polled, 74 percent, see Biden positively, down from 90 percent in December and 88 percent in March; Sanders’s positive image slipped from 83 percent in March to 73 percent in July.

Fewer than 1 in 3 Iowa Democrats see eight of the lesser-known contenders in a positive light: Businessman Andrew YangAndrew YangDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE, Reps. Eric SwalwellEric Michael SwalwellHere are the 95 Democrats who voted to support impeachment Moulton campaign makes formal case to DNC to be added to debate stage Bullock makes CNN debate stage MORE (D-Calif.), Tim RyanTimothy (Tim) John RyanDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D-Ohio) and Seth MoultonSeth Wilbur MoultonStanley McChrystal endorses Moulton for president 2020 Democrats react to 'send her back' chants at Trump rally 2020 Democratic candidates rip Trump remarks at campaign rally MORE (D-Mass.), Montana Gov. Steve BullockSteve BullockDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D), Sen. Michael BennetMichael Farrand BennetDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D-Colo.), author Marianne WilliamsonMarianne WilliamsonDemocratic strategist predicts most 2020 candidates will drop out in late fall Overnight Health Care — Presented by PCMA — Judge upholds Trump expansion of non-ObamaCare plans | Williamson says she believes in vaccines | House committee to hold oversight hearing on Juul Williamson says she believes in vaccines, acknowledges 'self-inflicted wound' MORE and Wayne MessamWayne Martin MessamMoulton campaign makes formal case to DNC to be added to debate stage Bullock makes CNN debate stage Top Democrats who could win presidential nomination MORE, the mayor of Miramar, Fla.

The survey of 600 likely Iowa Democratic caucusgoers was conducted June 29-July 1, over both landline and cellphones, carrying a margin of error of 4 percentage points.