Campaigning in Hawaii

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Nixon visited every state during his 1960 campaign, this is often seen as contributing to his loss since he didn't focus enough on the swing states.

How clear was it which states were swing states and which weren't? It's not like they could extrapolate from 1956.

Also Hawaii was actually a swing state that year. It voted for Kennedy by less than a point. I can see how it has few enough electors that it doesn't make much sense to bother travelling that far.