U.S. Department of Education Secretary Betsy DeVos leaves next month — and leaves a legacy that favored private and charter schools. WASHINGTON— During her four years in office, U.S. Education Secretary Betsy DeVos failed to broaden her appeal beyond the moment she won a wild Senate confirmation fight by the closest of margins. She didn’t even try. Instead, the billionaire Michigan native and Republican megadonor championed private and charter schools, often trying to funnel federal funding toward them. Her full-throated support outraged Democrats in Congress, riled the nation’s power...