Uh....
1. Eisenhower was loved and an incumbent. Goldwater was considered a radical senator. He wouldn't get more then 10% in any state.
2. But Eisenhower was in horrible health. He suffered numerous strokes and heart attacks. Some of his doctors did not want him to run in 1956, fearing the election would kill him. Now add 4 more years and another election.
3. But Eisenhower would win in a landslide in 1960 if he survives. Kennedy knows this so he isn't going to run. That's suicide.
4. The party isn't picking Stevenson. My money is on either LBJ or Humphrey.