NATIONAL HARBOR- After nearly $90 million was spent by both proponents and opponents of Question 7, Marylanders ultimately decided to approve the referendum last night by the slimmest of margins: 52 percent in favor compared to 48 percent against it. Question 7 supporters were finally able to celebrate at the National Harbor with fireworks after former Prince George’s County Executive Wayne Curry pronounced victory for the referendum. The approval of the ballot issue will allow the state to build its sixth casino, to be located in Prince George’s County, as well as add table games to existing slots facilities.