Democratic State Senator Michael Rubio was a rising star in the Legislature, poised to lead an effort to change the California Environmental Quality Act, when he unexpectedly resigned to work for Chevron. A special election will be held on May 21st for a temporary replacement for his southern San Joaquin Valley seat. It’s a largely agricultural district bounded by Fresno in the north and Bakersfield to the south. The Democratic Party has to win the seat in order to maintain its legislative supermajority. Vic Bedoian reports from Fresno.