While most of America was still mourning the 19 children slain in the Texas school massacre this week, former President Barack Obama made an unusual political misstep. Whatever people make of his policies, the former President is usually known for his adept timing. And that made his Tweet this week all the more strange. “As we grieve the children of Uvalde today,” the former president wrote, “we should take time to recognize that two years have passed since the murder of George Floyd under the knee of a police officer. His killing stays with us all to this day, especially those who loved him.”