Parent-teacher relations in America are beginning to look a lot like the time-honored playground game Red Rover. Teachers’ unions link arms to form a defense against, say, charter schools; the parents, sometimes with a little help from legislatures or the courts, easily break through.The same story played out again last week, when an Indiana court upheld the state’s school voucher law, rejecting the well-worn argument that the program violated separation of church and state.The ruling itself isn’t the surprising bit. Courts have upheld similar laws in Wisconsin and Ohio, as have the Supremes. What is new is how this case shows the regularity and predictability with which courts are upholding voucher laws these days. According to the HuffPo account, the judge’s written decision in the case adopted virtually the same argument made by the program’s supporters.It was inevitable, perhaps. Once upon a time, vouchers were “radical”; now their opponents are reactionary.Change is coming.