Nevada held primaries for congress and state office on June 14, 2024. Three candidates appeared on the Democratic primary ballot for U.S. Senate. The incumbent, Jacky Rosen, was easily re-nominated. One of the three candidates was Mike Schaefer, who is an elected official in California. He is a member of the Board of Equalization, a partisan office in California.
Schaefer was elected to the California Board of Equalization in 2018 as a Democrat, and re-elected in 2022. He is term-limited so he can’t run for re-election in 2026. As to why he ran for U.S. Senate in Nevada this month, he enjoys running for office. He is 86 years old. No media in California seems to have reported on his Nevada run, but here is a news story from last month from Nevada which did note that he lives in California. Schaefer got 2.2% of the vote in the Nevada primary.