This summer, revenues from the state’s five casinos neared the $100 million per month mark. State gaming officials say this is a milestone that signals that new casinos have taken root. Meanwhile, workers in Prince George’s County are readying a $1.3 billion MGM National Harbor casino to open in mid-2016. And a $150 million expansion to Maryland Live! Casino at Arundel Mills was approved last month. Today on Midday, we take a look at the explosion of activity at some of the state’s casinos. Our guests: Gordon Medenica, director of the Maryland Lottery and Gaming Control Agency, and James Karmel, a history and gaming expert from Harford Community College.