In New Jersey, One Form of School Choice that Makes Everyone Happy

Check out my post today at WHYY's Newsworks. Today's question addresses NJ's Interdistrict Public School Choice Program (IPSCP):
Just consider the woes: unanticipated expenses for sending districts; a drain on local public funds; erosion of local control; participation dependent on parental advocacy. It's everything the anti-choice community loves to hate about school choice, particularly charter schools and corporate-sponsored scholarships.
Yet IPSCP remains unscathed. What is it about this form of school choice that makes it palatable to everyone from teacher union officials to legislators to school boards?