On September 5, 2006, Felipe Calderón was declared President-elect after a highly controversial post-electoral process. Eight political parties participated in the 2006 presidential election; five of them joined forces in two different electoral coalitions.
Following the final announcement of President Calderon, López Obrador stated that he and his party, the PRD, would fight for a "vote-by-vote" general recount. López Obrador and his supporters began organizing mass protests, marches, and civil disobedience, culminating in a massive rally in Mexico City's historic Zócalo Square. Estimates of the crowd at the rally range from 500,000 to 3,000,000 supporters.
source: wikipedia
