In early April, thousands of Mexicans poured into the streets in over 20 Mexican cities to raise their voices in a chorus of protest against the government's ineffective and increasingly unpopular military campaign against drug trafficking organizations. These mass mobilizations mark some of the most heated condemnation yet of violence and impunity associated with President Calderón's U.S.-supported "drug war." The day of protest has been described as a historic "sea change" in Mexican public opinion.