Billionaire Democratic mega-donor Tom Steyer’s group is launching a $350,000 campaign to boost turnout among young voters in four California House primaries where Democrats fear they could miss the November ballot.

NextGen America is rolling out a campaign to urge 200,000 young voters to go to the polls on June 5 in four GOP-held districts: the seats held by Reps. Jeff Denham Jeffrey (Jeff) John DenhamBottom line Bottom line Lobbying world MORE and Dana Rohrabacher Dana Tyrone RohrabacherDemocrat Harley Rouda advances in California House primary Lawyers to seek asylum for Assange in France: report Rohrabacher tells Yahoo he discussed pardon with Assange for proof Russia didn't hack DNC email MORE as well as the seats being vacated by retiring Reps. Ed Royce Edward (Ed) Randall RoyceThe 'extraordinary rendition' of a US Presidential Medal of Freedom recipient, 'Hotel Rwanda' hero Gil Cisneros to face Young Kim in rematch of 2018 House race in California The most expensive congressional races of the last decade MORE and Darrell Issa Darrell Edward IssaDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program Wife of former Rep. Duncan Hunter sentenced to 8 months of home confinement Harris endorses Democrat in tight California House race MORE. All four districts were carried by Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE in 2016 and are part of Democrats’ planned path to taking back the House.

NextGen will have 20 organizers on the ground in those four districts and the new program includes direct mail and digital ads. Steyer’s group will also do heavy voter outreach on college campuses that are still in session, which includes sending hundreds of thousands of text messages and knocking on 15,000 doors by the June primary.

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Democrats are growing increasingly worried that they’ll get shut out of the general election thanks to California’s election laws. The state has a top-two primary where all candidates run, regardless of party affiliation, in a single primary with the top two vote-getters advancing to the November election.

The party fears that the large number of Democratic candidates running in each of these primaries will split the vote and lead to two Republicans facing off in the November election.

“Voters in California are fired up like never before, and they have the opportunity to lead progressives across the country with their energy and activism this year,” Steyer said.

“Taking back our government starts in primary elections, and by turning out in droves to the polls, California Democrats will send Trump and the GOP a strong message this June,” he said.

Steyer has been active in the 2018 midterms, vowing to spend $30 million to help Democrats regain the House majority.

California has been a big focus for the environmental activist, who has ruled out his own bid for elected office in the state. His group plans to spend at least $3.5 million to register and mobilize young voters in California, with a big emphasis on the seven GOP-held districts that Clinton won.

Steyer has also been focused on his “Need to Impeach” campaign, where he’s leading the charge to call on members of Congress to support impeaching President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE.