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Protestors hold a sign along with a US and Mexican flag in front of the US Capitol in Washington on September 10, 2012 during the 'Caravan for Peace,' across the United States, a month-long campaign to protest the brutal drug war in Mexico and the US. The caravan departed from Tijuana in August with about 250 participants and ended in Washington. AFP PHOTO/Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/GettyImages)

Protestors hold a sign along with a US and Mexican flag in front of the US Capitol in Washington on September 10, 2012 during the 'Caravan for Peace,' across the United States, a month-long campaign to protest the brutal drug war in Mexico and the US. The caravan departed from Tijuana in August with about 250 participants and ended in Washington. AFP PHOTO/Nicholas KAMM        (Photo credit should read NICHOLAS KAMM/AFP/GettyImages)