As California's businesses reopen, a majority of state residents are in support of allowing entertainment venues to require proof that their patrons are vaccinated or have tested negative for COVID-19, and for some employers to require vaccinations of workers, according to a statewide poll conducted by UC Berkeley's Institute of Governmental Studies that was funded in part by The Times. "The findings show that even at this later stage, politics powerfully shapes the way that Californians think about vaccination and the reopening of society," said G. Cristina Mora, co-director of the Berkeley institute.