In a "what is he thinking," Senator Arlen Specter has announced that he will visit Cuba and would like to meet with Raul Castro and Hugo Chavez. According to this article, the senator is quoted as saying that he has always believed in "dialogue." Read the first few comments, and you will see the basic fallacy of the whole situation repeated.
In a point that Cuban dissidents have made, a "dialogue" by definition requires two sides. The Cuban government has made clear that the only thing it is interested in is the unilateral lifting of the embargo and the acceptance, if not approval, of their sovereign right to enslave their people. As for the overtures some purport to have seen in regime pronouncements, I fear that they are but olive branches of the mind.