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 has a small lead over the field of Democratic contenders in California, but Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) is hot on his heels and has edged past Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) into second place, according to a new poll.

The survey from the University of California, Berkeley’s Institute of Governmental Studies finds Biden at 22 percent support. Warren and Sanders are in a statistical tie, at 18 percent and 17 percent, respectively.

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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.), who will need a strong showing in her home state to compete, is in fourth place with 13 percent, followed by South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE at 10 percent.

California Democrats will cast ballots earlier than in previous cycles, making the most delegate-rich state in the contest a huge prize for the contenders. Voters will cast ballots on Super Tuesday, on March 3.

The U.C. Berkeley survey is the latest poll to find Warren rising as she seeks to overtake Sanders in the race to be the party’s progressive standard-bearer.

A Monmouth University survey released Wednesday of Nevada, which is the third state to vote, found Warren with a clear lead over Sanders, 19 to 13 percent. That was the first public opinion poll to find her ahead of Sanders.

Also on Wednesday, the latest straw poll from the progressive website Daily Kos found Warren surging past Sanders to open up a 34 to 25 percent lead. While that poll is not scientific, it is generally considered an indicator of where the enthusiasm lies with the liberal base.

The new U.C. Berkeley survey of California found that Harris is the top second choice among California voters, with 21 percent, followed by Warren at 17 percent and Biden and Sanders at 12 percent.

When you combine Warren’s support among voters who called her their first or second choice, she has the most support in the entire field, followed closely by Biden, Harris and Sanders.

The U.C. Berkeley Institute of Governmental Studies poll of 2,131 likely Democratic primary voters in California was conducted from June 4 to June 10 and has a 3 percentage point margin of error.