democracy. we are not betting on building a dictatorship neither overt nor covert. changes will be profound. but they will adhere to the legal order that is established. >> and all this taking place at the epicenter of obrador's support, zocalo square. that's where our patrick op. mann filed his report. >> reporter: mexicans are celebrating what many called a revolution for this country. you see people pouring into the square behind me to celebrate an event they never thought would take place. the election of leftist populist candidate andres manuel lopez obrador. he's been running for president now for over a decade. this is his third attempt at the office. previous attempts he said kept him from gaining office because of corruption. right now, though, he has more than defeated the opposition. that's because more of mexican