Obama is resisting an effort by some increasingly assertive Latin American nations to allow Cuba to return to the OAS... after a 47 year absence.
It may be a purely symbolic question... since Cuba shows no desire to return to the organization.
Read more:
http://www.washingtonpost.com/wp-dyn/content/article/2009/05/28/AR2009052803766.html?hpid=topnews