José Cárdenas at Shadow Government argues that the prisoner release in Cuba should not prompt a change in U.S. policy. He ends with a rhetorical flourish, but one that is--as often is the case with embargo supporters--devoid of critical detail:
Rewarding the regime for a self-serving tactical maneuver that could be reversed at any time would be counterproductive and a waste of the leverage the United States does possess to push for fundamental reforms in the best interests of all 11,000,000 Cuban political prisoners.
What is this mysterious leverage we have? The embargo laws and all their corollaries are supposed to exert the necessary pressure "to push for fundamental reforms," but they clearly have not done so. If anything, they have benefited and continue to benefit the Castro regime greatly, because they offer an indefinite excuse for anything that goes wrong with the economy, and they are a global PR bonanza for the Cuban government.
Let's stop pretending about leverage, because we don't have any. Fidel Castro has played embargo supporters like a fiddle for a very long time.