Cuba's President Raul Castro, left, and his Bolivian counterpart Evo Morales arrive to the National Assembly for the inauguration of Venezuela's President-elect Nicolas Maduro in Caracas, Venezuela, Friday, April 19, 2013. The opposition boycotted the swearing-in ceremony, hoping that the ruling party's last-minute decision to allow an audit of nearly half the vote could change the result in a the bitterly disputed presidential election. (AP Photo/Fernando Llano)

Associated Press
Cuba's President Raul Castro, left, and his Bolivian counterpart Evo Morales arrive to the National Assembly for the inauguration of Venezuela's President-elect Nicolas Maduro in Caracas, Venezuela, Friday, April 19, 2013. The opposition boycotted the swearing-in ceremony, hoping that the ruling party's last-minute decision to allow an audit of nearly half the vote could change the result in a the bitterly disputed presidential election.  (AP Photo/Fernando Llano)
Cuba's President Raul Castro, left, and his Bolivian counterpart Evo Morales arrive to the National Assembly for the inauguration of Venezuela's President-elect Nicolas Maduro in Caracas, Venezuela, Friday, April 19, 2013. The opposition boycotted the swearing-in ceremony, hoping that the ruling party's last-minute decision to allow an audit of nearly half the vote could change the result in a the bitterly disputed presidential election. (AP Photo/Fernando Llano)