Last week, Senator Pat Roberts joined 29 other Senators in “calling for Attorney General Eric Holder to explain why his Justice Department is suing to force 570 needy children to remain in failing public schools based solely on their skin color.”The Kansas senator called it ironic that desegregation laws are being used to keep African-American students from using vouchers to transfer to better schools. The suit alleges it would lower the ratio of African-American students in some schools to unacceptable levels.Vouchers, officially called the Louisiana Scholarship Program, allow low-income students in C-, D- or F-graded public schools to enroll in participating private schools at taxpayer expense, explains reporter Danielle Dreilinger with NOLA.com and The Times-Picayune in New Orleans. Her story quotes a recent study by EducationNet, whose authors concluded, “The statewide school voucher program appears to have brought greater integration to Louisiana’s public schools.”