AS A FOUNDING board member of the Neighborhood House Charter School in Dorchester, I’m a longtime supporter of Boston’s charter schools. Last year, as mayor, I proposed state legislation to raise the cap on charter school growth while also giving charter schools access to state building funds for the first time.

It may surprise some, then, that I am voting “no” on ballot Question 2 — and urging everyone in the Commonwealth to do the same.

My reasons are clear. Question 2 does not just raise the cap. Over time, it would radically destabilize school governance in Massachusetts — not in any planned way, but by super-sizing an already broken funding system to a scale that would have a disastrous impact on students, their schools, and the cities and towns that fund them.