The arrival of charter schools in any city usually starts a fight.
Critics — whether district superintendents or teachers' unions or school boards or a traveling band of academic doubters — snipe at the newcomers, arguing that they're siphoning students and money from traditional public schools.
But as evidence from the 20-year-old charter experiment mounts, the snipers are in need of a new argument. There's little doubt left that top-performing charters have introduced new educational models that have already achieved startling results in even the most difficult circumstances.
