MGM National Harbor opening helps Maryland casinos...

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Maryland casinos generated a record $133.5 million in revenue during the month of December, fueled by the opening of MGM National Harbor, which brought in $41.9 million in its first 24 days of operation. The $1.4 billion casino and resort opened Dec. 8 in Prince George’s County to much fanfare and used a lineup of big name performers and the holidays to kickstart its place among the state’s other five casinos. The casino opening did have a negative affect on the closest competitor’s revenue at…