Before the Storm: Barry Goldwater and the Unmaking of the American Consensus by Rick Perlstein:
The press was still ignoring King’s protesters. Four days later, an eccentric white postman from Baltimore embarked on a quixotic walk from Chattanooga, across Alabama, to Mississippi, wearing a signboard and pushing a shopping cart full of civil rights literature. He got as far as a roadside near Attalla, Alabama, before he was shot twice through the head. The President’s press conference the next day was unburdened by questions about the killing or about the twenty-one unbroken days of demonstrations in Birmingham. No one seemed to care.