Image provided by Hugo Chavez Campaign Command shows Venezuelan Acting President and presidential candidate, Nicolas Maduro (2nd L) participates in an election campaign rally at San Cristobal City, State of Tachira, Venezuela, on April 3, 2013. (Xinhua/Hugo Chavez Campaign Command)

Image provided by Hugo Chavez Campaign Command shows Venezuelan Acting President and presidential candidate, Nicolas Maduro (R) participates in an election campaign rally at San Cristobal City, State of Tachira, Venezuela, on April 3, 2013. (Xinhua/Hugo Chavez Campaign Command)

Image provided by Hugo Chavez Campaign Command shows Venezuelan Acting President and presidential candidate, Nicolas Maduro (C) participates in an election campaign rally at San Cristobal City, State of Tachira, Venezuela, on April 3, 2013. (Xinhua/Hugo Chavez Campaign Command)

Image provided by Hugo Chavez Campaign Command shows Venezuelan Acting President and presidential candidate, Nicolas Maduro (R) participates in an election campaign rally at San Cristobal City, State of Tachira, Venezuela, on April 3, 2013. (Xinhua/Hugo Chavez Campaign Command)