Gambling expansion appeared to be headed for victory in Maryland early Wednesday morning with 80 percent of precincts reporting after a tightly contested, $90 million fight.

If the lead holds, a new casino will be built in Prince George’s County while table games and round-the-clock operation will be allowed statewide immediately. MGM Resorts International likely would operate the new facility — the company is planning an $800 million luxury casino at National Harbor — though the location would be open for bid.