Protesters of social organizations, public and private schools' students and residents take part in a demonstration protesting against the outcome of the July 1 general elections, in Mexico City, capital of Mexico, on July 22, 2012. Protesters marched to the Zocalo in downtown Mexico City. Thousands of demonstrators marched through Mexico City on Sunday to protest the outcome of the July 1 general elections, which declared Institutional Revolutionary Party (PRI) presidential candidate Enrique Pena Nieto the winner. [Xinhua]