Robert Kennedy
After the assassination of Martin Luther King Jr. and with President Johnson out of the presidential race, Robert Kennedy emerged in 1968 as the leading liberal figure in the nation. A critic of the Vietnam War, a strong supporter of civil rights, and committed to fighting poverty, Kennedy (the brother of the late President John Kennedy) ran a progressive campaign for president. In this photograph he is shown shaking hands with supporters in Detroit in May 1968. However, less than three weeks after this picture was taken, Kennedy, too, was dead, the victim of yet another assassination. Andrew Sacks/Getty Images.