Question

Who were the other candidates in 1968, and what were the major differences among them?

Answer 1

Richard Nixon, Hubert Humphrey, George Wallace 

Answer 2

Senator Eugene McCarthy—the antiwar candidate whose strong second-place showing in the New Hampshire primary had demonstrated Johnson's vulnerability—had abundant forces in the hall, but they were now relegated to the role of protesters. Senator George S. McGovern had rallied what remained of Kennedy's forces, but he, too, knew he led a group whose hopes had been extinguished.

Hopes this helps.