This story is worth keeping an eye on.
We've been able to hold off a major and messy policy debate about the intersection of vouchers, charters, private schools, accountability, and choice. Court cases like this though can force the conversation.
Bottom line: if public money can constitutionally reach religious schools via vouchers without many public accountability measures why can't highly accountable, publicly funded charters constitutionally have some religious component?
Tricky stuff.
--Andy Smarick