I think Nixon shouldn't have made his pledge to campaign in fifty states, since that led to him having to campaign in states he had no chance of winning or states that wouldn't matter.
Also, Nixon should've done a radio-only debate. Those who listened to it on the radio thought Nixon won, but those who watched it on TV thought JFK won.
These two. Also, Eisenhower was still a very popular President in 1960, and Nixon should have gotten him to start campaigning for him a lot sooner, and, of course, not make the "Come Back to me in a week" gaffe.
