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Mr. O’Malley has undergone an interesting transformation in recent months from a man who was long lukewarm on gambling.

This spring, he told The Washington Post it was a “piss-poor way to advance the common good” and also blamed Senate President Thomas V. Mike Miller Jr.’s pursuit of a gambling expansion bill for the General Assembly’s failure to pass a revenue package during its regular session.

But with urging from Mr. Miller, Prince George’s Democrat, and others, the governor called a special session in August to pass legislation allowing the referendum and has turned into a cheerleader for expanded gambling.

Tom Howell Jr. and David Hill contributed to this report.