Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE continues to hold a lead in polls of several primary states following the second round of Democratic presidential debates last week.

Surveys released this week by SurveyUSA and Franklin & Marshall College showed Biden with a lead in Pennsylvania, California and North Carolina over other top-tier contenders.

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Biden led the field with 36 percent support in North Carolina and 25 percent in California, according to the SurveyUSA poll, while he had 28 percent in Pennsylvania, according to the Franklin & Marshall College survey.

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The SurveyUSA polls found Biden with more than double the support of his closest challenger in North Carolina — 36 percent to Sen.'s (I-Vt.) 15 percent — while the Franklin & Marshall College survey found him leading Sen.(D-Mass.) by 9 points, 28 to 21 percent, in Pennsylvania.

In California, where nearly 500 delegates are up for grabs, Biden leads the field with 25 percent support among voters, while Warren comes in second with 21 percent and Sanders follows with 18 percent.

Biden has held the position of front-runner for the nomination since declaring his candidacy earlier this year, though the former vice president saw his support erode in some states following the first Democratic debates in June when he clashed with Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.).

Another poll of New Hampshire voters released this week found Biden with a narrower 4-point lead over Sanders, 21 to 17 percent, while Biden led former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) by 9 points, 28 to 19 percent, in a poll of Texas voters.

The SurveyUSA polls were conducted Aug. 1–5 among 2,113 likely Democratic voters in North Carolina and 528 likely Democratic voters in California; information about the polls' margins of error were not immediately available.

The Franklin & Marshall College survey was conducted from July 29 to Aug. 4 among 627 registered voters in Pennsylvania and has a margin of error of 6 percentage points.