California Proposition 23 (2010)
Oil companies Valero and Tesoro spent millions backing a ballot measure to suspend California's 2006 climate law until unemployment fell below 5.5 percent for a year. Supporters framed it as job protection. Environmental groups and clean energy investors campaigned against it.
Voters rejected it roughly 61 to 39 percent.
The vote showed that industry-funded rollbacks of environmental law could lose badly in a blue state, and California's climate program continued.
Proposition 45 followed the same pattern in reverse: a business-backed measure to change environmental review lost after a well-funded opposition campaign and a late polling slide.
