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The leader of the Mexican Zapatista Army for National Liberation (EZLN) "Subcomandante Marcos" (L), joins thousands of workers and students in a rally in Texcoco, in the state of Mexico, 05 May 2006, in support of the citizens of this city and of San Salvador Atenco who clashed with the police on Wednesday when street vendors violently resisted efforts to relocate them. AFP PHOTO/OMAR TORRES (Photo credit should read OMAR TORRES/AFP via Getty Images)

The leader of the Mexican Zapatista Army for National Liberation (EZLN) "Subcomandante Marcos" (L), joins thousands of workers and students in a rally in Texcoco, in the state of Mexico, 05 May 2006, in support of the citizens of this city and of San Salvador Atenco who clashed with the police on Wednesday when street vendors violently resisted efforts to relocate them.   AFP PHOTO/OMAR TORRES        (Photo credit should read OMAR TORRES/AFP via Getty Images)

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Zapatista leader "Subcomandante Marcos" reads some letters 03 January, 2005 on his way to the Mayan archeological ruins of Palenque, Chiapas, Mexico --part of the Zapatistas Mexican tour-- where he is awaited by supporters. Former Zapatista rebel Marcos has launched a national tour aimed at rallying support against globalization, just as Mexico's presidential campaign readies to go into high gear. AFP PHOTO/Susana GONZALEZ (Photo credit should read SUSANA GONZALEZ/AFP via Getty Images)

Zapatista leader "Subcomandante Marcos" reads some letters 03 January, 2005 on his way to the Mayan archeological ruins of Palenque, Chiapas, Mexico --part of the Zapatistas Mexican tour-- where he is awaited by supporters. Former Zapatista rebel Marcos has launched a national tour aimed at rallying support against globalization, just as Mexico's presidential campaign readies to go into high gear.   AFP PHOTO/Susana GONZALEZ        (Photo credit should read SUSANA GONZALEZ/AFP via Getty Images)

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Mexico's Zapatista National Liberation Army leader (EZLN) "Subcomandante Marcos" chats with supporters and EZLN members after a meeting with settlers from Oventic, Chamula and different surrounding areas 04 January, 2006 at La Hormiga settlement, San Cristobal de las Casas, Chiapas, Mexico. Former rebel Marcos has launched a national tour aimed at rallying support against globalization, just as Mexico's presidential campaign readies to go into high gear. AFP PHOTO/Susana GONZALEZ (Photo credit should read SUSANA GONZALEZ/AFP via Getty Images)

Mexico's Zapatista National Liberation Army leader (EZLN) "Subcomandante Marcos" chats with supporters and EZLN members after a meeting with settlers from Oventic, Chamula and different surrounding areas 04 January, 2006 at La Hormiga settlement, San Cristobal de las Casas, Chiapas, Mexico. Former rebel Marcos has launched a national tour aimed at rallying support against globalization, just as Mexico's presidential campaign readies to go into high gear.       AFP PHOTO/Susana GONZALEZ        (Photo credit should read SUSANA GONZALEZ/AFP via Getty Images)

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Mexico's Zapatista National Liberation Army (EZLN) leader Subcomandante Marcos rides a horse in playa del Carmen Mexico, Quintana Roo State 16 January 2006. Marcos has launched a national tour aimed at rallying support against globalization, just as Mexico's presidential campaign readies to go into high gear. AFP PHOTO/Elizabeth RUIZ (Photo credit should read ELIZABETH RUIZ/AFP via Getty Images)

Mexico's Zapatista National Liberation Army (EZLN) leader Subcomandante Marcos rides a horse in playa del Carmen Mexico, Quintana Roo State 16 January 2006. Marcos has launched a national tour aimed at rallying support against globalization, just as Mexico's presidential campaign readies to go into high gear.  AFP PHOTO/Elizabeth RUIZ        (Photo credit should read ELIZABETH RUIZ/AFP via Getty Images)

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The leader of the Mexican Zapatista Army for National Liberation (EZLN) "Subcomandante Marcos", joins thousands of workers and students in a rally in Texcoco, in the state of Mexico, 05 May 2006, in support of the citizens of this city and of San Salvador Atenco who clashed with the police on Wednesday when street vendors violently resisted efforts to relocate them. AFP PHOTO/LUIS ACOSTA (Photo credit should read LUIS ACOSTA/AFP via Getty Images)

The leader of the Mexican Zapatista Army for National Liberation (EZLN) "Subcomandante Marcos", joins thousands of workers and students in a rally in Texcoco, in the state of Mexico, 05 May 2006, in support of the citizens of this city and of San Salvador Atenco who clashed with the police on Wednesday when street vendors violently resisted efforts to relocate them.   AFP PHOTO/LUIS ACOSTA        (Photo credit should read LUIS ACOSTA/AFP via Getty Images)