A new study out is throwing doubt on raising state revenues with expanded gambling. The report by the New Hampshire Center For Public Policy Studies says the state would at best break even between state revenue and social costs if it and Massachusetts move ahead with casino plans. The governor, who supports expanded gambling, is questioning the findings on social costs. A state senator says if Massachusetts goes ahead with a casino and New Hampshire does nothing it will put a 50-million-dollar dent in state tax revenue. Expanded gambling is expected to pass in the Senate, but in the House it’s currently a toss-up.