The election year was tumultuous; it was marked by the assassination of Martin Luther King Jr. in early April and subsequent riots across the nation, the assassination of Robert F. Kennedy in early June, and widespread opposition to the Vietnam War across university campuses. Nixon ran on a campaign to restore law and order to the nation's cities and provide new leadership in the Vietnam War. A year later, he would popularize the term "silent majority" to describe those he viewed as his target voters. Humphrey promised to continue Johnson's war on poverty and to support the civil rights movement. Humphrey trailed significantly in polls taken in late August but narrowed Nixon's lead after Wallace's candidacy collapsed and Johnson suspended bombing in the Vietnam War.