The California Democratic Party has endorsed state Sen. Kevin de León over Sen. Dianne Feinstein, backing a challenger who is taking on a longtime incumbent.

The endorsement came after Feinstein had encouraged party leaders not to endorse either candidate for Senate in the name of party unity. But on Saturday, de León won 65 percent of the delegates’ votes, surpassing the 60 percent threshold necessary to secure the endorsement.

“Earning the endorsement of so many leaders and activists of the @CA_Dem party isn’t just an honor and a privilege; today’s vote is a clear-eyed rejection of politics as usual in Washington, D.C.,” de León tweeted Saturday.

The intraparty battle has become a microcosm for the fight over the soul of the Democratic Party, with some pushing the party further to the left. De León has argued that he is more liberal and more willing to fight against President Donald Trump. Feinstein has countered that she is well-equipped to take on the Trump administration, thanks in part to her seniority in the Senate, which gives her significant influence over policymaking and oversight activities.

The all-Democratic general election is a product of the Golden State’s unique primary system. De León finished second to Feinstein in the state’s top-two primary on June 5, where candidates from all parties compete on one ballot and the top two vote-getters advance to November.