In a different scenario, the governor’s race in California would already have taken shape. Aspiring candidates would have been making appearances around the state. Donors would have begun bankrolling their favorites, and organizations would have started to announce endorsements.

Instead, Kamala Harris came home.

The former vice president, after a stinging defeat in the presidential race last year, has shaken up the 2026 governor’s race by her mere presence in California. Speculation has grown each week since her return from Washington: Will she or won’t she enter the race?

After flying back to Los Angeles last month, Ms. Harris has stood with firefighters in Altadena, greeted evacuees at a Red Cross shelter and toured fire damage in Pacific Palisades. During her most recent stop, she did little to quell speculation.

“I am here, and would be here, regardless of the office I hold, because it is the right thing to do,” Ms. Harris said when reporters pressed her about whether she was running for governor.

The possibility has made it difficult for most other Democrats to move forward, realizing that any calculations they make now would be upended if Ms. Harris entered the race . The 2026 contest to replace Gov. Gavin Newsom, who cannot run again because of term limits, is currently populated by lesser-known aspirants, many of whom likely would step aside if Ms. Harris decided to run.

“She hasn’t frozen the field, but definitely made it icy enough to force everyone to slow down and watch their step,” said Dan Newman, a Democratic strategist who advised Mr. Newsom during his campaigns for governor.