LOS ANGELES — Republican Steve Garvey is advancing to a November election to fill the U.S. Senate seat held for three decades by the late Dianne Feinstein, a rare opportunity for the GOP to compete in a marquee statewide race in this Democratic stronghold.

The former baseball MVP who played for the Los Angeles Dodgers and San Diego Padres will face Democratic Rep. Adam Schiff.

California puts all candidates, regardless of party, on the same primary ballot and the two who get the most votes advance to the general election. That means Republicans are sometimes shut out of high profile statewide races given the grip Democrats hold on the state. The GOP has failed to advance a candidate to the general election in two of California’s last three U.S. Senate races.

Still, Democrats are expected to easily hold the Senate seat in November, a relief for the party as it seeks to defend a narrow majority. A Republican hasn’t won a Senate race in California since 1988.

But the campaign nonetheless represents a new era in California politics, which was long dominated by Feinstein and a handful of other veteran politicians.

Garvey and Schiff also advanced to the November ballot in the race to fill the remainder of Feinstein’s term, following the general election. Democratic Gov. Gavin Newsom appointed Laphonza Butler , a longtime Democratic organizer, to serve out Feinstein’s term, and Butler chose not to seek election to the seat. The winner of the November election would serve a truncated term through early January, when the full, six-year term would begin.

The race is California’s first open U.S. Senate contest since 2016. Even before Feinstein announced in early 2023 she would not seek reelection, many of the state’s ambitious Democrats were eagerly awaiting their shot at the coveted seat.

Garvey’s candidacy, buoyed by name recognition among older voters in particular, threw an unexpected twist into the race. The dynamic between Schiff and U.S. Rep. Katie Porter grew increasingly tense in the campaign’s closing weeks as both vied for a general election spot.

The first-time candidate Garvey notched his spot on the fall ballot by positioning himself as an outsider running against entrenched Washington insiders who he blamed for rising grocery and gas prices, out-of-reach housing costs and an unchecked homeless crisis in cities.

He owes a debt of thanks to Schiff and supportive super political action committees, which ran millions of dollars in advertising spotlighting Garvey’s conservative credentials, which indirectly boosted his visibility among Republican and right-leaning voters.

He enters the fall campaign a long shot to fill the seat.

The state Republican Party has been in a decades-long tailspin in heavily Democratic California, where a GOP candidate hasn’t won a U.S. Senate race since 1988 and registered Democrats outnumber Republican voters by a staggering 2-to-1 margin. Republicans didn’t even have a candidate on the general election ballot in the 2016 and 2018 Senate races.

Garvey is hoping to follow a pathway cut by other famous athletes-turned-politicians that includes former California Gov. Arnold Sc hwarzenegger , a one-time bodybuilder and actor who became the last Republican to hold the state’s top job, Utah Rep. Burgess Owens, a former NFL player, and former professional basketball great Bill Bradley, who became a long-serving U.S. senator in New Jersey.

He calls himself a “conservative moderate” and argues he should not be buttonholed into conventional labels, such as former President Donald Trump’s Make America Great Again political movement.

Garvey has twice voted for Trump, who lost California in landslides but remains popular among GOP voters, but he has said he hasn’t made up his mind about this year’s presidential contest. He personally opposes abortion rights but does not support a nationwide abortion ban and will “always uphold the voice of the people,” alluding to the state’s longstanding tilt in favor of abortion rights.

He also had to overcome the resurfacing of tawdry details about his private life, including having two children with women he wasn’t married to, that had undercut the clean-cut public persona he cultivated in his Dodger days.