Gov. Gavin Newsom’s signature Monday on Assembly Bill 37 makes California the eighth state in the nation with a law on the books requiring every voter to be mailed a ballot. The law takes effect in January and will require ballots to be mailed to all voters for statewide elections in June and November. AB 37 also applies to local elections, potentially improving turnout in community contests but also increasing costs, given that vote-by-mail ballots are provided with prepaid postage.