Cory Booker stood in the U.S. Senate for 25 hours without sitting, eating, or leaving the floor. That choice didn’t come from ego or ambition. It came from a responsibility to people whose voices don’t echo through Capitol Hill. The single mother trying to hold on to Medicaid. The veteran whose mental health depends on Medicare. The elder in Detroit who built this country and now can’t get through to Social Security. Booker didn’t come to perform. He came to bear witness.