An opposition protester holds up a poster that reads in Spanish "Maduro you are the cavity of Venezuela" during an opposition May Day march in Caracas, Venezuela, Wednesday, May 1, 2013. Venezuelans filled the streets of the capital Wednesday in rival marches by the opposition and the government less than a day after a brawl on the floor of congress injured several opposition lawmakers. (AP Photo/Fernando Llano)

Associated Press
An opposition protester holds up a poster that reads in Spanish "Maduro you are the cavity of Venezuela" during an opposition May Day march in Caracas, Venezuela, Wednesday, May 1, 2013.  Venezuelans filled the streets of the capital Wednesday in rival marches by the opposition and the government less than a day after a brawl on the floor of congress injured several opposition lawmakers. (AP Photo/Fernando Llano)
An opposition protester holds up a poster that reads in Spanish "Maduro you are the cavity of Venezuela" during an opposition May Day march in Caracas, Venezuela, Wednesday, May 1, 2013. Venezuelans filled the streets of the capital Wednesday in rival marches by the opposition and the government less than a day after a brawl on the floor of congress injured several opposition lawmakers. (AP Photo/Fernando Llano)
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