Opponents said the proposal — which echoes the language of a proposed 2016 ballot question — in theory could allow the state to add new charter schools each year until no district public schools remain. "People have asked me many times, what's the right number of charter schools? I don't know the answer to that, but we have 37,000 families who simply want for their kids what everybody else wants and for the most part gets here in the Commonwealth of Massachusetts for theirs — which is a shot at a great education and an opportunity on which to build a great future," Baker said. Baker said his bill would let charter schools use a weighted lottery system that provides additional weight to high-need and low-income students, as well as students within a particular geographic zone. Baker said that part of the bill would let the charter school operators take some of the tools that they developed to help turn around those lower performing schools.