Second debate sees little boost for Biden challengers: poll

Former Vice President Joe BidenJoe BidenEric Holder: Democrats 'have to understand' that 'borders mean something' Young insurgents aren't rushing to Kennedy's side in Markey fight Biden says he'll release medical records before primaries 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 SandersYoung insurgents aren't rushing to Kennedy's side in Markey fight Biden's debate performance renews questions of health Saagar Enjeti rips Harris's 'empty promises' MORE (I-Vt.) in second place with 18 percent support, Sen. Elizabeth WarrenElizabeth Ann WarrenYoung insurgents aren't rushing to Kennedy's side in Markey fight Biden's debate performance renews questions of health On The Money: Democratic candidates lay into Trump on trade | China exempts US soybeans, pork from tariff hikes | Congress set to ignore Trump's wall request in stopgap measure MORE (D-Mass.) in third with 15 percent support and Sen. Kamala HarrisKamala Devi HarrisHarris keeps up 'little dude' attack on Trump after debate The crosshairs of extremism  On The Money: Democratic candidates lay into Trump on trade | China exempts US soybeans, pork from tariff hikes | Congress set to ignore Trump's wall request in stopgap measure 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.