A record number of voters have registered in California ahead of its presidential primary this week, the state's secretary of state announced Friday.

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A report released on Friday shows that there are 17,915,053 voters registered as of the state’s May 23 deadline, the most the state has ever seen going into a primary.

“Nearly 18 million California citizens are registered to vote in the June 7 Presidential Primary,” Secretary of State Alex Padilla said in a statement.

“In the 45 days leading up to the voter registration deadline, there was a huge surge in voter registration — total statewide voter registration increased by nearly 650,000. Part of this surge was fueled through social media, as Facebook sent a reminder to all California users to register to vote.”

According to the report, about 72 percent of eligible Californians are registered to vote.

Of the state’s voters, about 45 percent are registered as Democrats, which is a one-point increase since April. Republicans make up about 27 percent and unaffiliated voters account for about 23 percent.

Around this date in 2012, there were 17,153,699 registered voters in Calif.

Democratic presidential candidates Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE and Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE have both campaigned heavily ahead of the Tuesday primary. California, the most populous state, offers the most delegates of any state.

Polls have shown the two Democrats nearly even. Clinton has big edge overall in delegates, but Sanders is hoping for a Garden State win to bolster his argument that superdelegates should support him over Clinton.

On the Republican side, presumptive nominee Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE has no competitors in the California primary. But he is campaigning in the state nonetheless, pledging to fight to win it in the general election.