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BROWNSVILLE , Texas ( AP ) _ In speech after speech , Mexico President Vicente Fox argues for his dream : A free flow of workers across an open border , an international boundary that ceases to be a barrier .
 BROWNSVILLE , Texas, Texas, Mexico, Mexico President, Mexico President Vicente Fox, his, workers, an open border, an international boundary that ceases to be a barrier, that, a barrier
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 BROWNSVILLE , Texas, Texas, Mexico, Mexico President, Mexico President Vicente Fox, his, workers, an open border, an international boundary that ceases to be a barrier, that, a barrier