Second debate sees little boost for Biden challengers: poll

Former Vice President Joe BidenJoe BidenTop House Republican calls for probe of source of NYT Trump tax documents Judge's ruling creates fresh hurdle for Trump's TikTok ban Harris says she hasn't 'made a plan one way or another' on meeting Supreme Court nominee MORE continued to command a steady lead among the crowded primary field after the second round of Democratic debates, according to a poll released Friday. 

The Morning Consult poll conducted after the debates found that 32 percent of potential Democratic primary voters selected Biden as their top-choice candidates, compared to 33 percent after the first Democratic debate in June. 

The poll put Sen. Bernie SandersBernie SandersPresident Trump faces Herculean task in first debate The Hill's Morning Report - Sponsored by JobsOhio - Trump's tax return bombshell New Biden campaign ad jabs at Trump's reported 0 income tax payments MORE (I-Vt.) in second place with 18 percent support, Sen. Elizabeth WarrenElizabeth WarrenThe Hill's Campaign Report: Trump's tax bombshell | More election drama in Pennsylvania | Trump makes up ground in new polls New Biden campaign ad jabs at Trump's reported 0 income tax payments Democrats blast Trump after report reveals he avoided income taxes for 10 years: 'Disgusting' MORE (D-Mass.) in third with 15 percent support and Sen. Kamala HarrisKamala HarrisHarris says she hasn't 'made a plan one way or another' on meeting Supreme Court nominee Compromise, yes — but how? A pre-debate suggestion Biden must clarify his stance on energy for swing voters MORE (D-Calif.) in fourth with 10 percent support. After the first debate, Sanders had 19 percent support and Warren and Harris each had 12 percent support. 

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The first Democratic debate did result in more changes, with Harris spiking from 6 percent support to 12 percent while Biden slid down from 38 percent. 

In the latest poll, conducted Aug. 1, researchers surveyed 2,419 registered voters who said they might vote in a Democratic primary or caucus. The results have a margin of error of plus or minus 2 percentage points. 

Biden, Harris, Warren and Sanders are among just 7 of more than two dozen contenders who have already qualified for the September debates. Biden has consistently polled as the front-runner.