I think most of the US agrees that relations with Cuba should be normalized. Even the US-born Cubans here in So. Florida don't harbor all the ill feelings that the older Cubans who had to flee Cuba possess.
However....it is the powerful lobbying and voting block of Anti-Castro Cubans who keep this alive. At some point we just have to get over the past and look to the future.
Perhaps an Obama Administration will think a likkle more clearly.