Richard Nixon will win over Stevenson. Invasion at the Bay Pigs would be successful equals no Cuban missile crisis. Less US intervention in Vietnam equals less worse Vietnam War. JFK maybe alive today since JFK didn't ran. By 1964, Nixon maybe opposed either LBJ, Humphrey or JFK (if JFK is popular before 1964). Since this period is a prosperity of the American economy, Nixon re-elected. In 1968, Vietnam War is less worse than in OTL. Much better United States will be expected.