The campaign that could bring legalized sports betting to California is the most expensive ballot-initiative fight in U.S. history at about $400 million and counting, pitting wealthy Native American tribes against online gambling companies and less-affluent tribes over what's expected to be a multibillion-dollar marketplace.
A torrent of advertising has buffeted Californians for months, much of it making promises far beyond a plump payoff from a game wager. Some ads coming from the consortium of gambling companies barely mention online betting.
