Poll: Clinton up 13 over Sanders in Calif.
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Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonPaul Ryan defends Navy admiral after Trump's criticism Retired Army General: Trump is ‘acting like an 8th grader’ in attacking ex-Navy SEAL who led bin Laden operation Questions grow about FBI vetting of Christopher Steele’s Russia expertise MORE has a 13-point lead over rival Bernie SandersBernard (Bernie) SandersOvernight Energy: EPA official steps down after indictment on ethics charges | Sanders to hold town hall on climate | Zinke slams 'environmental radicals' for fires Sanders to host town hall on climate change Sanders on 2020 White House bid: 'We're looking at it' 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 John TrumpPaul Ryan defends Navy admiral after Trump's criticism Trump discussing visit overseas to troops following criticism: report Retired Army General: Trump is ‘acting like an 8th grader’ in attacking ex-Navy SEAL who led bin Laden operation MORE 45 percent to 33 percent, with Libertarian candidate Gary JohnsonGary Earl JohnsonHillicon Valley: Social media struggles with new forms of misinformation | US, Russia decline to join pledge on fighting cybercrimes | Trump hits Comcast after antitrust complaint | Zuckerberg pressed to testify before global panel Ex-Facebook exec ousted from company sparked controversy with pro-Trump views: report Heinrich wins reelection to Senate in New Mexico 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.