Poll: Clinton up 13 over Sanders in Calif.
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Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonCommunion vote puts spotlight on Hispanic Catholics Trump's biggest political obstacle is Trump The Memo: Some Democrats worry rising crime will cost them MORE has a 13-point lead over rival Bernie SandersBernie SandersSenators say White House aides agreed to infrastructure 'framework' Briahna Joy Gray: Biden is keeping the filibuster to have 'a Joe Manchin presidency' On The Money: Biden to fire FHFA director after Supreme Court removes restriction | Yellen pleads with Congress to raise debt ceiling MORE in California, according to a new Hoover Institution Golden State poll.

Clinton has 51 percent support among likely Democratic primary voters to 38 percent for Sanders.

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Sanders has the edge among younger voters. He got 61 percent of voters under 30 years old in the poll, to 30 percent for Clinton.

And among voters with "no party preference," Sanders leads by 40 points.

In a possible general election match-up, Clinton leads presumptive GOP presidential nominee Donald TrumpDonald TrumpIran claims U.S. to lift all oil sanctions but State Department says 'nothing is agreed' Ivanka Trump, Kushner distance themselves from Trump claims on election: CNN Overnight Defense: Joint Chiefs chairman clashes with GOP on critical race theory | House bill introduced to overhaul military justice system as sexual assault reform builds momentum MORE 45 percent to 33 percent, with Libertarian candidate Gary JohnsonGary Earl JohnsonNew Mexico lawmakers send recreational marijuana bills to governor Judge throws out murder convictions, releases men jailed for 24 years On The Trail: Making sense of Super Poll Sunday MORE taking 4 percent.

The survey was conducted among 1,700 Californians May 4–16. The margin of error is 3.47 percentage points.

According to the RealClearPolitics average of polls, Clinton has an 8-point lead over Sanders in California.

But one recent poll showed her with just a 2-point lead in the Golden State.

Clinton is expected to add more campaign stops in California ahead of the primary next week.

Sanders has said he plans to remain in the race until the Democratic National Convention in July and will fight for every delegate possible. He said he expects to do well in delegate-rich California and has vowed to stay in despite Clinton's delegate lead.