How could the outcomes of California's congressional primaries affect the future of the Democratic Party?

House Democrats are looking to Tuesday's primaries in California as a major test of the anti-incumbency sentiment among their voters. Why it matters: This will be the first time in the 2026 election when multiple House Democrats in their 70s and 80s face off against primary insurgents who have hammered them for their lengthy tenures. California Democratic Reps. Mike Thompson, Doris Matsui and Brad Sherman — all 70 or older — are among those facing tough primary fights with younger Democratic challengers.Their Democratic colleagues are watching "all of them closely," one senior House Democrat said, as well as the LA mayor's race and the state's gubernatorial election."Just to see the anti-incumbent sentiment," another senior House Democrat told Axios. State of play: June 2 is California's jungle primary, in which all candidates for a given office run in one contest and the top two vote-getters — regardless of party — advance to a runoff in November. Often, that dynamic matches up the top-performing Democrat and Republican. However, in several deeply blue House districts, the incumbent is more likely to face another Democrat in the fall.This year, an unusually large number of incumbents are facing well-funded challengers who are going after their lengthy tenures and arguing that it is time for a new generation of Democratic leaders. These are the House races that Democrats have their eyes on: California's 4th District: Thompson, a 75-year-old member of the centrist Blue Dog Coalition first elected in 1998, is trying to fend off 35-year-old venture capitalist Eric Jones. Both Democrats have raised huge sums, with Thompson bringing in just under $3 million as of March 31 and Jones raising over $3.2 million over the same period, including a $364,000 personal loan.Jones has tried to harness anti-incumbency sentiment, with ads declaring that "too many Democrats have been in Washington so long, they're not up to the fight," and hitting Thompson as "corrupt" and "ineffective