California has the potential to become, it’s estimated, a multi-billion-dollar sports gambling market, larger than everywhere in the world except the UK.

Which is why, with 11 weeks left to the November election, casinos, American Indian tribes and other interested parties have put up some $364 million — the greatest amount ever spent on a state ballot measure — to try to legalize it, shape it or kill it.

There are two competing proposals on the ballot. Proposition 26 would only allow sports betting in person at tribal casinos and horse-racing tracks. Proposition 27 would let gambling companies offer online betting anywhere in the state in partnership with tribes.