Education vouchers, as used in Cleveland and other U.S. cities, permit parents of public school children to choose any public or private school for their children they wish. The presumption is that they will make a wiser choice about which school will help their children learn, than local or state bureaucrats would.
School voucher programs are most popular among inner-city blacks, and opposed most by the Democrats and teachers' unions. The main argument against vouchers (and other such programs, like schools-of-choice) is that they take money away from a given school, which makes it more difficult for the teachers to provide quality education for the remaining students. While the result of a voucher program is good for the students who are able to take advantage of it, it severely disadvantages the remaining students, staff, and faculty.