The first returns in Tuesday’s special election for county supervisor show Chula Vista Mayor John McCann and Imperial Beach Mayor Paloma Aguirre in the lead to advance to a runoff later this year.

A total of 13 vote centers will open in San Diego's First Supervisorial District Tuesday as the final day of voting to replace former San Diego County Supervisor Nora Vargas begins.

About 13% of South Bay voters have cast ballots in the special election to elect a new District 1 county supervisor. Why it matters: Election Day is Tuesday. The last special election, in 2023, for a county supervisor saw just 22.