The National Harbor in Prince George’s County. Photo by afagen

After weeks of incessant political advertising, voters in Maryland narrowly sided with expanding gambling in the state, setting the stage for a luxury casino to emerge from the National Harbor in Prince George’s County. With all precincts reporting, supporters of Question 7 gained 52 percent of the vote to the 48 percent claimed by opponents.

The fight over the measure was hotly contested, with supporters and opponents pouring $87 million into advocacy and advertising—making the referendum the single costliest electoral contest in Maryland’s history. Big-name supporters of Question 7 included Oscar de la Hoya, David Copperfield, and the Washington Redskins.

While a majority of voters in Anne Arundel and Baltimore counties came out against Question 7, their counterparts in both Montgomery and Prince George’s counties polled in favor. In Prince George’s County, for one, 202,417 voters sided with the measure, while 137,936 went against. The margin was smaller in Montgomery County.

What comes next will be an $800 million luxury Las Vegas-style casino only miles away from D.C. MGM Resorts International, which owns and operates casinos across the country, has promised a high-end gambling, dining and night-life destination that could bring in $424 million in annual revenue.

And yes, if you heard fireworks last night, it wasn’t because Obama had won—supporters of Question 7 set off a small fireworks show at the National Harbor in celebration if their win.