Last week, the White House announced that the president and first lady had invited Kate Cox of Dallas to join them as a guest during the State of the Union address. Cox, of course, is the woman who challenged the state’s abortion law after her unborn child, at 20-week’s gestation, was diagnosed with Trisomy 18, a severe and usually fatal genetic abnormality. The pregnancy was planned and wanted, Cox said, but because of previous cesarean deliveries and other complicating factors, it was also high-risk — something Cox surely understood before conceiving. That risk, which according to her legal …