Wagers might generate between about $9 million and $61 million in state tax revenue if lawmakers decide to make Massachusetts sports betting legal, the Gaming Commission said Thursday in a white paper that mapped out how the Legislature might think about introducing another new form of gaming in the Bay State. Massachusetts, like many other states, is waiting to learn if the U.S. Supreme Court will strike down any or all of the Professional and Amateur Sports Protection Act, which limits which states can offer legal sports betting. A decision in the case Christie v. National Collegiate Athletic Association could…