The phasing out of the D.C. voucher program appears to be purely politically motivated. Teachers unions do not like even very successful and popular voucher programs.because most private and even charter schools are not unionized, which is one of the reasons private and charter schools tend to be successful to amazingly successful. They can hire and fire the teachers that are team players and contributors, as opposed to union protected slackers or teachers that haven't bought into the epistemological philosophy of their school. Teachers unions generally put their own interests ahead of those of students.