Jennifer Levitz:

Massachusetts lawmakers are considering eliminating a cap on the number of charter schools that can operate in the lowest-performing school districts, including here in the capital city.
While other states also have weighed lifting caps, charter advocates point to left-leaning Massachusetts as a somewhat unlikely model for the movement. “This demonstrates that charter schools are a viable reform,” said Nina Rees, president of the National Alliance for Public Charter Schools, a nonprofit aimed at advancing the movement. “If it can happen in Massachusetts, it can happen anywhere.”
Charter schools receive public funding but, unlike public schools, employ mostly nonunion teachers and have autonomy in school districts, which allows them to set their own conditions, such as longer school days. They have long been embraced by Republicans for introducing choice in education, but have been assailed by some teacher unions and others as hurting traditional public schools.

Madison appears to be going in the opposite direction.
Related: Madison Mayor Paul Soglin: We are not interested in the development of new charter schools”