The latest UC Berkeley Institute of Governmental Studies poll co-sponsored by The Times shows Republican Steve Garvey with a slight lead with days to go in the primary election for U.S. Senator.

The poll shows a remarkable surge in support for the former Dodger in a race in which three well-known Democrats — Reps. Adam B. Schiff, Katie Porter and Barbara Lee — are battling.

It’s the latest indication that Garvey could win one of two slots in the general election, which still heavily favors the Democratic candidate.

How did Garvey get here? Here is an explainer from the pages of The Times:

The primary election: Good for Garvey

Garvey is favored by 27% of likely voters, Schiff 25% and Porter 19%. Lee (D-Oakland) garners 8%, while 12% of likely voters pick a different candidate and 9% are undecided.

In effect, Garvey and Schiff are tied because the difference is within the poll margin of error,

The general election: Good for Schiff

Schiff (D-Burbank) would be an overwhelming favorite to beat Garvey in heavily Democratic California. The poll finds Schiff starting with a significant lead in a two-way matchup, 53% to 38%, with 9% undecided. By contrast, a general election between Schiff and Porter (D-Irvine) would start out tied, with 4 in 10 voters undecided, the poll found.

The Garvey surge

In a deep blue state like California, it might seem like a surprise that a Republican can take the lead in a primary election. But this is an unusual one. The Democratic primary is very competitive, with Porter and Schiff major figures in the party and Lee a popular figure with the left. So they are dividing Democratic votes in the deeply blue state.

In early polls, Garvey did not do all that well. But recent polls have shown a surge as he’s become better known — particularly among Republicans.

Why? Garvey’s campaign has spent just $1.4 million through mid-February, a tiny fraction of the money Schiff and Porter raised.

But Garvey has gotten some help… from Schiff.

The ads

Schiff has spent upward of $25 million on television advertising, most of which has framed the contest as a two-candidate race between him and Garvey. An outside group of Schiff allies has spent roughly an additional $10 million on a similar effort.

“Two leading candidates for Senate. Two very different visions for California,” a narrator intones, noting later that Garvey “is too conservative for California” and voted for Donald Trump twice.

Times political reporter Benjamin Oreskes explained the strategy this way: “While the message will turn off Democratic voters in the state, it may increase the former baseball player’s appeal to Republican voters — as it is designed to do, according to two political strategists.”