Powerful tribal casinos and their rivals in California’s multi-billion dollar gambling industry are fighting an epic battle in the Legislature this year. Millions of dollars in tax revenues for local cities hang in the balance.

Pending legislation would let California’s tribes sue their competitors, private card clubs, over their claim that card rooms are violating the tribes’ exclusive rights to Las Vegas-style gambling.

Card rooms have responded with an enormous lobbying blitz. The Hawaiian Gardens Casino in Los Angeles County spent a staggering $9.1 million on lobbying last year, the second highest amount reported to state regulators. Only the international oil giant, Chevron Corp., spent more.