 CHICAGO--BUSINESS WIRE--Rush Street Interactive, Inc. NYSE: RSI RSI, one of the most trusted and fastest-growing online casino and sports betting companies in the United States, today announced that it has secured market access opportunities in Ohio, Maryland and Missouri. RSI has entered into a strategic partnership agreement with Penn National Gaming, Inc. Nasdaq: PENN Penn National. Under the terms of the agreement, RSI will have the ability to offer its award-winning BetRivers 