Former Republican lawmaker
Runner, who recovered from a double lung transplant three years ago, will be alone on the March 17 special election ballot for a district that includes parts of Los Angeles and San Bernardino counties.
The 21st District seat was vacated when Republican Sen.
Runner, who lists herself on the ballot as an educator and business owner, previously served in the state Assembly and was elected to the Senate in 2011. She did not seek reelection so she could recover from the lung transplant, which stemmed from a rare autoimmune disease.
Being uncontested, she said, is "the greatest news a candidate can hear. I never expected to be in that position."
Three Republicans will be on the ballot competing for an Orange County seat that opened up when Republican state Sen.
In that district, the 37th, the contestants are state Assemblyman
If no candidate receives a majority, a runoff election will be held May 19 between the two who won the most votes.
In the 7th state Senate District, four Democrats and one Republican will vie under those same rules to fill a vacancy created when Democratic state Sen.
The Democrats are Orinda Mayor Steve Glazer, a former strategist for Gov. Jerry Brown; Assemblywoman
The Republican candidate is Michaela M. Hertle of Pleasanton, an information technology businesswoman.