California Proposition 27 was a ballot measure proposed in 2022 that aimed to legalize online sports betting in the state. The proposition sought to allow licensed online platforms to offer sports wagering to adults aged 21 and older, with a portion of the revenue directed towards homelessness services and mental health programs. The measure faced opposition from various groups, including tribal casinos, which argued that it would undermine their existing gaming operations. Ultimately, California voters rejected Proposition 27, maintaining the current restrictions on online sports betting within the state.